Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67c9837d9c94647…

MALICIOUS

PDF

89.0 KB Created: 2021-09-07 23:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5dd85fc5f69e702fa3254e86dc44fed1 SHA-1: 85fcb9c81ff1e789a117e2714f0aaec7dfa6dfb6 SHA-256: f67c9837d9c946479bc51cd402bd346ae9e7c955d55f061033f9f9dfc9fad65e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://artechq8.com/beta/uploads/files/duxujilimugawiwokosifal.pdf In PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/sugiderifurigesi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a44b9c4edc---86485135468.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084792e78f46---susuweworosotepid.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/5210470392.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7c3aba7ca2482c7b0218f27d66a9b1b8/parirerebubobutejux.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/mumasakojatagadejefomadil.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/duwemuvegejasafo.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/73107664094.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/mesolojabegufukokidokit.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/robusifakasetukamema.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e1295758d08f34015924998a612a1aae/92604455658.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/61591999077.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/magipaputewanopuvuzuseb.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/72422934435.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/45520523531.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/s9h33vnh10toogqbjbrkbihbj2/32771990880.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/36934099056.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tofazefegubu.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/tumewuwonise.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/33904590526.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/guvasejutejibev.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160928a157e2f6---20857691090.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/jufenuwuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=latest+general+knowledge+mcqs+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7179135fc723f2ef0a5a76e69a74c35e/57159880935.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_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 19496 bytes
SHA-256: 90687561127442af00d79f3275845839a5dedaa768b7b9af163d5f044b71a2ff
font_01_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 11152 bytes
SHA-256: 1321a3f881786e11d353a8dc279380bcc3edf364bdfe811b62b22066a6386e3a
font_02_sfnt_off00013e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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