Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d44a51d68090c17…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 11:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09e449cf32fccfcf74134cf5d5089eb7 SHA-1: 215ed949abcc1a61ec1ca987c419a931095cc14b SHA-256: 3d44a51d68090c176ebf3538946a5f5f69b33f8f82fafe281ed3b1f99a4350ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=banking+accounting+basics+pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210911_C6BB971C6599849D.pdf
    • https://proia.bg/userfiles/file/tebitalif.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138efb03c085---76577944471.pdf
    • https://keyword-lda.pt/site/upload/file/11438532447.pdf
    • https://mumegram.com/userfiles/file/57110881513.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/36083226020.pdf
    • http://mobil-tech.com/files/55185978492.pdf
    • http://nuocmambason.com/upload/fckimagesfile/d7227e23d42d083cb12fffdc77168f47.pdf
    • http://decentlogistics.pk/survey/userfiles/files/rupizorodipabam.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jcaj4pkmuqnspe9ifg0d32ujd5/keginiwiv.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/kosimimem.pdf
    • http://meskerjager.nl/media/files/vexikisajutixija.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a73e2d3cc7---11194054051.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/icloov2hm0700jppvrd17sa474/94916469289.pdf
    • https://riwg.in/userfiles/file/tatoxonemarerasubusari.pdf
    • https://simbhaolipower.com/images/file/88968635964.pdf
    • http://macro-e.com/app/webroot/userfiles/files/jefeto.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b5d5f201---81110295004.pdf
    • http://millenium.moscowfashion.net/content/xuploadimages/file/79482587425.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/cae68a6991575f1ca1c11203642c7220/naretabutuvobevezikavokep.pdf
    • http://vetcasatenovo.it/userfiles/files/komipanotogapejefef.pdf
    • http://botosani.ro/img/uploads/file/58339351798.pdf
    • https://jotekonybakterium.hu/userfiles/files/dabuxenidava.pdf
    • http://namlinhchivietnam.net/userfiles/image/file/32878869510.pdf
    • http://imhkayseri.com/resimler/files/57462827490.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a4.bin
1baf7a3b749282c003223c856c66e6009238f45f6c657151f889518683d08f08
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 10900 bytes
font_01_sfnt_off000101a1.bin
0a61d278d9680abf0a6b1df88c38e94f2e5c0f7bad17368e19268b306d8676ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 18160 bytes
font_02_sfnt_off00013061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13061 16792 bytes