Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf9934f711334d0…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 18:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 641b557ca0ac3174a2d50e2630279533 SHA-1: 50503e264370a00da391b023f88ebf2f93b4b2a0 SHA-256: dbf9934f711334d0be1cff694649533e193e4fb3b12fd88262ec358976f0ec71
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/42cdee103295c660c3a33cc6d1ea820a/wunavipamukolamixum.pdf In PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/miver.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/vubobex.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/24890487254.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/37fc05fa42e1336a94c44226515893c4/fokebexasufutige.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/79288692335.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/6992887004.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160747bd06ad5b---kovexesizaporunadajuki.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f6ec4538---xotogegadajomagu.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d47d0b214---rifemifikebojam.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9150abd494b1f782fae5c2c97dc55326/finilezo.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf80cb7f5---44585152431.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/a7a5fcbc7d902d42790bf6437aba62cb/93537006096.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f7cf8fc621d562fdf4477b7ed14f800c/65550842011.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0e726e573---tirukiletojozitolep.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/79725663615.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/fefeliposegoweku.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b44e1293---5846728412.pdfPDF link annotation
    • http://0851gay.org/userfiles/202106file/2021062701043270554.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/727546e3f011d2fa2e24c29118b24c7c/figolikegezisavixami.pdfIn PDF document text
    • http://clarasonic.com/upload/file/97632757287.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/039f0754e64e1ae2e0672d1c262ce8a6/pixobeburig.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb908b85df---25621088886.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dvdiri87491cbi0iei1v358j00/gimamotoluko.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078313ebc448---zikipozese.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a3d8df8e0---94565369888.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/belesov.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b3e12d390b2483b8694967f751a57b39/38838185035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=episode+mod+apk+unlimited+gems+and+passes+android+1PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 17104 bytes
SHA-256: c2c218c40034e6653648d7ffb1e70cfaadc32139782d97cf2ade12ebb0cdece6
font_01_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E1 10960 bytes
SHA-256: de349e1f6c1120529135a875d05533e55c07e04924027a50e18a073aa7d93a4e