Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80e308788d710f4…

MALICIOUS

PDF

82.0 KB Created: 2021-08-06 13:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6beacbdcc1f9fe96bc0635145786805d SHA-1: e336e53a0d4b1456b7aa7759aeb4c1b00419622f SHA-256: b80e308788d710f45ce2201aa97dc6196ea97684e44f7f24e9b8d11f6faeda0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings point towards an attack pattern designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=module+2.5+clinical+overview+example PDF link annotation
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/08347d09ea24246d2d1663e87588415b/sefikoruza.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c5310eb07---mopivizemiwogudemiduvuw.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/kabopitadiz.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/xavubani.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/gezepanutizofokuref.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/topop.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/jenumomod.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/7700984349.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/xepipapuxutasadagox.pdfIn PDF document text
    • https://www.gcnaura.in/images/uploads/files/15552615255.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/97069475742.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/nefogonidek.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/85b7989265c5f20ad12c37430659dbf8/mukaredeburagawukefitim.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a3c8d0d31299bed35dd73054f5fd195/71127156695.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/luzapal.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072712c0e3e7---gegejusuxixawevegasizuj.pdfIn PDF document text
    • http://innotack.com/userfiles/files/48231227649.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa7e8a3a1---31987922639.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160beec2a7e8ec---12621356815.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074822267900---jurutofosupi.pdfIn PDF document text
    • https://stopserv.ru/files/file/ruginomuxopek.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/82100459481.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6395985d---57045152072.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd4048ef7c---giwozadimivanamujurenan.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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 11076 bytes
SHA-256: d96649c8bf74cb2c6c2cab2477d2b3eecf5f2f60e19e4691564d62af9c025207
font_01_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 17140 bytes
SHA-256: 8218307ccfabd6730b6b9b289903f753fced6e1fa756d1f871ac78cb5d61a2d3
font_02_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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