Malicious PDF — malware analysis report

Static analysis result for SHA-256 0589169639cdf4f8…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 15:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0300d515b278ce78d70a6550612cb5ac SHA-1: 3460b9e0746c70766b3678a68a316ac99ff5b0c6 SHA-256: 0589169639cdf4f84592c92171fa8546381f1f9427f853d145531f38587ca5a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://crysiq.ru/uplcv?utm_term=ob+gyn+pdf+free PDF link annotation
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/fegoz.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/ligikegutijovid.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/nubazujolesefodi.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/zodonitomililaraxevu.pdfIn PDF document text
    • http://change-sexy.com/files/files/durewizi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9b1a5410---94490570355.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/waretapefuxedimewin.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d58b06141de564809a3f393a850ff45e/98687056067.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af8d4350ef---55227008612.pdfIn PDF document text
    • https://hgb.se/filer/file/bejebesamo.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/lobufizikuvitafukixabiza.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/7393490956.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734c197a201---41940292290.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/31340834072.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/xeketinetubogufisopel.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/71157279127.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34c7019042---18677147906.pdfIn PDF document text
    • http://glassick.com/userfiles/file/rororidukekar.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160841c8b1ee07---welofiraxukafezureko.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d182c7f7---vodiluxa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161029e48b72e7---35869398980.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14e6558603---mimagajawi.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/97482039567.pdfIn PDF document text
    • http://bscartridge.com/pic/kugajox.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/83788875272.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/81972395121.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/15863684826.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_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 16700 bytes
SHA-256: 2fba4cc67a3ab1d84742e06baafeabbb77847e9ca88de23556483f0232d1d87d
font_02_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 10268 bytes
SHA-256: b66490269aa870a5abf94ad40df9ffa034d99a51ae2c166024aa73d4da99d1cf

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