Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e334428ab6cdb39…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 23:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f121184328030e1d0bdadf428d4234c SHA-1: 097d0a332835bf7867e4d4ea5b1601642e6063d9 SHA-256: 5e334428ab6cdb39983dfdd66aff4bc501266f6d9848b6c42dcf2a7fc6819c46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The primary URL suggests a lure related to downloading WhatsApp Plus, a common tactic for distributing malware or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=descargar+whatsapp+plus+para+android+softonic
    • https://autosaloncenter.com/uploads/files/7497530892.pdf
    • https://gangnampools.com/contents/files/giwutegadakujavolilisagi.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ab3b9b146---towubukewikorusexusol.pdf
    • http://rcp-ranstadt.us/files/10758848665.pdf
    • http://badgerhillfarm.uk/kumim.pdf
    • https://seo-methodes.com/userfiles/file/vuzosawifutukope.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/nufosowoxixadufopos.pdf
    • https://zaragozadenoche.es/upload/files/fugejafelexusoruxa.pdf
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/wezid.pdf
    • https://maritime-models.com/userfiles/file/93863659791.pdf
    • http://mlight.cz/archiv/file/mojutefug.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134b10536e7b---10283502706.pdf
    • http://paulgraphics.paulsfashion.in/files/bemavexasilavawodozudal.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eaf478f199---gavuk.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133126f123a5---78309462692.pdf
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/dedisebekibopuwasakot.pdf
    • https://laznia-radom.pl/userfiles/file/35953215845.pdf
    • http://bpsstudio.hu/uploads/mamuxivosuno.pdf
    • http://wang023spa.com/userfiles/202109file/2021092418072070554.pdf
    • http://cargologicru.com/sadm_files/pezadusesinit.pdf
    • https://speak82.com/_UploadFile/Images/file/60890092417.pdf
    • https://gencshoworganizasyon.com/upload/ckfinder/files/12542074644.pdf
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/50535043751.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1b9.bin
27ee1fe5649f7ed531657425fa47e912ac368e0f3e1a88e33e084444acbbfd9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B9 11088 bytes
font_01_sfnt_off0000cb67.bin
34a1bad0688257f9a31006771aa56875c7565a9ce36443deac5c9f19813a7a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 14888 bytes
font_02_sfnt_off0000f0da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 16792 bytes

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