Malicious PDF — malware analysis report

Static analysis result for SHA-256 029da94c6e01e05e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 20:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0cab8334e44c3aaddc9d9bc1217ba6fc SHA-1: 6da06b7779bf9312895b04598b1f55bc2da90fa4 SHA-256: 029da94c6e01e05e8b7a3a9ee28be95e3315f91bdf27ecdaa1bcc499acecaf3d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to external sites, many hosted on potentially compromised WordPress installations or disposable domains. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c90c7e0e16c592017c9548f9b192d042/kojatolafozamenulamera.pdf In PDF document text
    • http://tcsm62.org/uploads/news/file/11632231475.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/61074771796.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/9eb250d9740655c9132444bf72ede6fa/pibunuramigofovig.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vetosidamagurub.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1622b85bf2---kumuvedijoduti.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/renegifopejirev.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3u886dg42nr0iu5udo6pqif525/xanigesugiwaxizupip.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/defuvimajitejowu.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/vogafifexulikumudusupe.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/lefixanumujesikafapiwi.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/vefotadikapejifibobadiviz.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/23763812594.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a065943c78c517a1e3d7c694c3e92309/miliwabe.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d3c80f290d1c9951b4363e906a7c2a4a/razigarenavedes.pdfIn PDF document text
    • https://oliogalanis.com/file/xarifuwe.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe5891d1cc---xibegawe.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/sepuvuxu.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/nexenovenasadov.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7561672a7---najat.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8no2l0o46rc1urudit12me56ks/badasigipuketobigukopek.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/42198224328.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5637397cf9b4d1277848f4fbcc0107cb/vemubibipunojegotobolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=semiconductor+optical+amplifiers+connelly+pdfPDF link annotation
    • 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_off0000c37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37A 17912 bytes
SHA-256: 0ca2efefdb5bc6addcfe052d74fd3da7f55a40a18ddbf395901cae75573f33be
font_01_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 11068 bytes
SHA-256: 1ef26430a13edf48361ab755c1c7ef675c8da736723edb75692ea9dccd2238dc
font_02_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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