Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cec1f8abaed6272…

MALICIOUS

PDF

116.9 KB Created: 2021-08-17 04:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2d022e579a248fdf48dc300cacbd8834 SHA-1: 2c79f5c01a4e5b1a8c335ebdee3405311bd385bb SHA-256: 7cec1f8abaed627206de148c1d57fed07afdf01114e907e0ea9081a83c38c276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=hitachi+rcu+120+chiller+manual PDF link annotation
    • https://alshamiltrading.com/alshamilfiles/file/gotujajasunedimis.pdfIn PDF document text
    • https://unosms.us/userfiles/file/pabukefedojiveruvi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f454c6cdab6---vidatovizukipekewopusuxeb.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/22893187110.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/37555601752.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/depusenavekosexe.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/lilaxireji.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/433476a4d8052b6169697e2746430b99/94371349017.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/bixedivagokiwexanufab.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/posefadawifasopub.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/m9oklbv55f9ih3f3dfu26rnm20/gorogupapiwuboketoladibom.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e387b4822---wumuxagufu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f011f1a97---6683053308.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/luxewu.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/2059337885.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/97541289439.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5257527c---tudesaturibojivubogikog.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24a7d444a7---polugimaxedifinijigedix.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d76f5649dcc---jubuzuwimu.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/nelivebuvenogi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bl3pvmigf8mtlq628n9o0oa0mo/gebanutazag.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/nemexezakofaroresalup.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/30c2402b11794c3d7919b91c256a69a3/49261133063.pdfIn PDF document text
    • 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_off00015e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001761a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1761A 10592 bytes
SHA-256: d815bffe474905a5b7224785e36684b8d4ab0b31b0f18573ce95aba61d9abf4b
font_02_sfnt_off00018e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E1C 21772 bytes
SHA-256: d04e643c09551850722c2e4fd925824131cf47ee142c53f69a1c71b10d483e5b

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