Malicious PDF — malware analysis report

Static analysis result for SHA-256 d957bb5fce2f4d5d…

MALICIOUS

PDF

104.0 KB Created: 2021-06-28 01:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a0588eec3c6fbf96627fdd9ee8175b4 SHA-1: 445120e626a140d4875c37bd31a24bdfd8a90cd5 SHA-256: d957bb5fce2f4d5df8fe9d0c4c4af673b7b7f1a2a7aa78595f7d2def6584454c
176 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 CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns suggest the document is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9nm3cmq8e8b7bbckvf1t4l85f5/94321971255.pdf In PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/17854e1fdba0be5f2cddcb59b17c2a7b/fonarewefeziperukaso.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928d7d90232---78225266385.pdfIn PDF document text
    • http://premium-h.info/files/files/67810559502.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b5ce5533---39799730183.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cf400ffbe---34139291375.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/dunezijufebizojiwajega.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/559d49447980ff36fb5bc75f48ff4444/dafewidapunazejawupog.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ttcid77bdodm0ckb152m1a9q7l/30308867520.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd6f1c49e8d30101d676c007d0214ec7/ludipelimi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b8d4cea9effc6d17993b990bae2f15d7/dipupitutenebitivuvonivit.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/noketogifo.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/tavufefimiwibaw.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/48071284498.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/3ef86e7762e9f2135a40a001c8c9ed29/78724384936.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/dalasoziralax.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0814e2ee0b---soraponakuranokuvotubu.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/xasutorivujaku.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/garemo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1c5ja6adu9jvk473t65tpgnsr8/53093032056.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/betateremamenonoke.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098c55f007fc---64852363059.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc94b3a760---60033772625.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tubokudeguvuxisutes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=diploma+in+home+sciencePDF 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_off00013542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13542 10444 bytes
SHA-256: 1b17c75704c835248c86ab25aaf4bc0793090eaab5355e548a67cd8fbed08374
font_01_sfnt_off00014cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C5 17080 bytes
SHA-256: 0e4cc44bbd84c29e12e93c6cd6c30382fc5def99ae0ae96583e24ecae9381d2a

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