Malicious PDF — malware analysis report

Static analysis result for SHA-256 3113b1473898867c…

MALICIOUS

PDF

85.5 KB Created: 2021-06-30 02:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bbee1b02a7756341968e6ddc92cff85 SHA-1: 9648e0cb6f3641bd53abec96aa62c5f0bef56a63 SHA-256: 3113b1473898867cdb3562e877bf1d871f09b9d56623940b2cffdc6f46fb88aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body is unreadable, but the presence of these links suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/qgf0prh71q2gehb1l2nv82ba6e/dakosoxofofizulup.pdf
    • http://holidayservicemarsala.it/userfiles/files/46752191745.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b604e917a9f---50019764436.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/937a461fdbf67f10e6bc6877b437ea30/luvanur.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d117ba08d231b470a1454a304baaaf86/40371974241.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77177785c4---77187096733.pdf
    • https://szud94.hu/img/sajatfile/files/rizix.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/cco40s523t4c18ifngfvef4fi1/gupuwutozifebexiwusasuzok.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/53785328204.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f51c01c065d31c8997403f2f08458cfb/76179900903.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ee56bb384df8b12989cfa797e243d37d/bamoxitok.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1b047b8d0---maguzijunawuruxeze.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20b215659a404596fde6982b36869656/19166357873.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8pb8o5mipf7bjcqqk3dmqmsmpt/jonabovedijegiti.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ml9epjvf9o6f5sj53qcnnutfu5/18121322813.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hgj7omlcb43mo6am62rb7tcit7/pupupapituvavad.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a941a32dc---jibekusetafeduvineja.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608208347eafa---96269739528.pdf
    • http://phuocthuan.vn/images/pic/file/95051126681.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/673781b085f000fcc0750f55b3df6e50/zebob.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdbdf0debb4cfa3736c3bd5ccfa5f2dd/revotiwed.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c62d717ff---11898504767.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/59189391050.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4bdf909daaf93632a6f4cb74b19b50f2/segisosibokofodewamar.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dea1e35dffef5793032fef3f6f5f5962/sarixamubasop.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=metastatic+clear+cell+sarcoma
    • 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_off0000ee98.bin
a5bade5e6d6b6c390eff3570e248b8e228a113027c4d939a54d71e5485900d22
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 10280 bytes
font_01_sfnt_off000105c2.bin
ab2d50d96406f55a940974e67c22f2504a4a20cddc2b52e1a213d641357fa7db
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 16512 bytes
font_02_sfnt_off00013097.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13097 16792 bytes