Malicious PDF — malware analysis report

Static analysis result for SHA-256 d437aa807d0e7760…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 10:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70f983ebb94e9d9227a1e61d07eae5dd SHA-1: 1fe4121dc2a2b9bdf6163831fc995f8f376ca193 SHA-256: d437aa807d0e77602e01b45e47bcac2f35a20c09841e48b8a511214ccafae2b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archism.ru/uplcv?utm_term=fifa+20+obb+file+download+for+android PDF link annotation
    • http://anhhieu.vn/hinhanh/file/81431397683.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/wiwubuju.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/nobovisowi.pdfIn PDF document text
    • https://ratodua.com/contents/files/21158864259.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/gupikarawuwiladixuwezowiv.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/jetiguxiritasudome.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630464882.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/tofirewobuxelu.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/7247116924.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/nebejapitibidojikanemet.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/sopelawojosolemitomu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0omku71upcgdtk1emkoppfc153/62399700015.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/73960550793.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/misetinekijibenodi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136466163a45---zaxazojububuriru.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-2/20210902191723903085.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/28086106470.pdfIn PDF document text
    • http://builderall.info/userfiles/file/26161293222.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/757883793.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/niwuzizubunitojubunewax.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb210e2ff---veretukukupamuga.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/64178a4b89ca2250b76009f3766b4ca1/bobifoduxanile.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/divutizojejomenagubunu.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/lewoledeliziratasojedagep.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/jijufawelogafugiw.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/40003727258.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_off0000cc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC02 20264 bytes
SHA-256: 7f01a31c7259f5da2602a3a672a2b142aeb73fe1919f708004741749a07bc3c9
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 10528 bytes
SHA-256: b6d94c844424631b834d85d6512e21be9c7bb372d75fe1c8ad1b931c7795bd40

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