Malicious PDF — malware analysis report

Static analysis result for SHA-256 6369bbd626a0ce5d…

MALICIOUS

PDF

109.9 KB Created: 2021-07-04 01:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eafe196617711188c06e3da9501ec297 SHA-1: 1873144542be87db2c583fb7b0a86a12cb1da331 SHA-256: 6369bbd626a0ce5df5bc26a282e938319d92d3c4b0a33b31487b6560bace52e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to create a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=fever+with+no+chills PDF link annotation
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/rl4sf63628je5a46efid840q78/60775731741.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a1470a065e70db323a60b052bfc76cf4/tojikupekewukimogatajan.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/57657879919.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef93e80176---19413679192.pdfIn PDF document text
    • http://dges.in/userfiles/file/24831992840.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7efca342eb---lubozaweganumudijenu.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1ff47b10---jipiri.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca869ef0a0---39035764673.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a943b86b8a8---53321895903.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cf4d0b6d---21022291037.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/ditagel.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/2818394211.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa65d1606---mijufapewog.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/03d9ce6cf8f47e8b6d352612385a73d5/muravikezuvasejeve.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/oo18q4lneb1jvvtklbegrdo147/82226218734.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/fa63ekilf7bc2a05va0tf43ot6/zalepije.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ab4867a6f6eb86c060dd04effde68d4b/bapozivisepigikipojep.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090a0bc8f63e---67698704588.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607652a13dff8---93919941238.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/13596903645.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085328ed4d26---refival.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/99021028201.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/26lsggcuj028iv9a673mj2k1f2/38694138658.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd801da635---ketadukijowudaxoser.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_off00014c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C89 10292 bytes
SHA-256: ab5d087e866d3242d8cd9c3de3f7c8e256aa257a4983406e55dca05c3d401976
font_01_sfnt_off000163af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AF 17348 bytes
SHA-256: b2313a92cdd27737649eb25f33a9246fc423da4be36c592b6b54a0ed112a4154
font_02_sfnt_off00019117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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