Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4fd203d496ee28…

MALICIOUS

PDF

78.3 KB Created: 2021-10-09 16:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 39e578058b7bab13485c94ca68b68f3d SHA-1: ad5bceafe74bd1720f726653222873027cbb4a1b SHA-256: 4b4fd203d496ee28bd0724523ceb03412586ae7dd1b6de6ce1fe3920da178da7
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'SE_QR_LURE' also indicates a potential QR code phishing attempt, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/uplcv?utm_term=wolf+pup+ipa+abv PDF link annotation
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/61f9d3671a810c96d0c6c75d2cb016b7/15336653027.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/sovadigep.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/gimegafi.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/reguzavurinupaxo.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/zanoxogoje.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/xajonizirapalolefud.pdfIn PDF document text
    • http://xn--evdebakmhizmetleri-k0c.com/uploads/file/94600579600.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/jifevorotulibulupawe.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/48907a29bbd1fde02e5f3a1643855220/30002609965.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/fibog.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a5571dd2aa1e973574e97f77f1d341d9/lesupe.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/megexemajifamulag.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/2958002330.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/93730949674.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/misidadesod.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/20391483187.pdfIn PDF document text
    • http://leton.pl/userfiles/file/suzisujiperadefetera.pdfIn PDF document text
    • https://sharenkon.com/files/petutuxawiwidesajososaze.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/faxomif.pdfIn PDF document text
    • http://ranch.pl/files/file/81688487130.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/31911272921.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/kulilipojup.pdfIn PDF document text
    • http://idcla.net/upload/files/bofaf.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/72217126183.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/69305793336.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_off0000cd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 10048 bytes
SHA-256: dab195be3ee41f789ad2e41fb67f29bdcb67cf4bc2e6fe4b78bd5f8b9d130292
font_01_sfnt_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 18460 bytes
SHA-256: 189cc5b8a9a819d0cde2fed6332a615969ff656ba5326fea171927ad73b3e565

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