Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87a414263e816ce…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 13:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b0d8db9e55268ab989fe9ad06af68ee SHA-1: 9c39357bf2b2101765af02e6008bf183a69a04c4 SHA-256: d87a414263e816ce63cab7acdbf69596163b7385e25156621c5dabcff7f392e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of 'utm_term' parameters in some URLs indicates a potential SEO poisoning or spamming tactic to attract victims searching for specific content. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://oniceh.ru/uplcv?utm_term=opengl+programing+guide+pdf PDF link annotation
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607200af3e4f3---7384851422.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/74516473212.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/16468026468.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/gixapufepebuzip.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/802b040b776e938ca7561ede03668fa4/rotiwozetixeweniw.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/kabebamoxofudib.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d78e2ea32b---kijitofulesokosex.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cac04578502---nisokowigubiriloxepibu.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/25209823941.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3401083e6fc0fee9cd1d1b8bb0534cd8/78433355791.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9bbb74ef---fawupa.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/n43423q93dekfccromiu2csoir/lamugelilogibisufowibiv.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/7dffa9b681b86fced02e330dbbc5b08d/gupatasepeti.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6b6d5cdec8593f7417d17c4505546ad9/46691693737.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/vgq87bpouojuk3q0pfsggtk15v/93311142765.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/mosokavezuvataxenamapek.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/50995741497.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1627947780.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/74050507615.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/gagoledexog.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e81190b8c---66074585109.pdfIn PDF document text
    • https://iwistw.com/upload/files/57575600217.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a625f0164ca---wipiruxevoxowavexomu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ec79264e5f57efffe258933b7aa7927/tonagivuzamapo.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_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 17392 bytes
SHA-256: 014104283d292a738d3eb8ebab076e156949941bb44caf92c0c0544e696bba6d
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 10700 bytes
SHA-256: a3529252fbacbf32d12bd39915e20777e581d937630b2763e578299a2c601cf8

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