Malicious PDF — malware analysis report

Static analysis result for SHA-256 42371be61aba66df…

MALICIOUS

PDF

92.6 KB Created: 2021-07-24 22:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9a0de7effaa905ff7bfc4c6f0b6835b0 SHA-1: 25460f1271d310a5ab56335dd69c85f4ec9742f9 SHA-256: 42371be61aba66df759db6b1b8aa6e943878b46e7ea7027cfe2ca8d8a644b63d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL findings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3a618042---rozinarolodafasafobafopaw.pdf In PDF document text
    • http://pkynfe.net/userfiles/file/kogolusovip.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/58451364532.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6fed018ace4c746184455efa9fcd9902/limelilob.pdfIn PDF document text
    • http://asustainable.com/global/file/31297128805.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7282b56f6e4148d5b55c4a6090525b7b/62970723874.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e085d3ccb10---vijezageleragi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/voxixojukoni.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/selemofetafiridepiluxile.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8hup58rdk87mo7jb0m66bubphu/tumejizitedikukipowebog.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/14507023098.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af963144fb7---2039931739.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/8d2f3d1b9830fbadd0a87b28962b3848/rugeriwi.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/neginawakolerogatugiwozev.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/37436694457.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/90805443429.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/51717608260.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b776ee89ae5595e59e295691e278f144/7562989386.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160975ae452059---xirufugeziw.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/19114794291.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094894e20bda---93742299497.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/pokoz.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/27529818777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=est%C3%A1ndares+ieee+802+para+redes+al%C3%A1mbricasPDF 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_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 18236 bytes
SHA-256: d26be284b64c506652c56bb01ca6f01bab8d20ebc4773a34b42b0be31b71dfe3
font_01_sfnt_off00012f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8B 11308 bytes
SHA-256: e40034d3b6cc7d913bf87b39239bf82ee9c0929c7681de910d515a35fda7fbc1
font_02_sfnt_off00014984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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