Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cef951e53783b7…

MALICIOUS

PDF

81.2 KB Created: 2021-06-26 09:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a8879630bf22e78c3ffa1018c6787724 SHA-1: 726220ebeba6f4cb6beb2d0e2cb4231100e9b4b6 SHA-256: 65cef951e53783b70ce14df8ca2f4c61831c87cc0cca2bc2921c3ff72121823f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs are present, many hosted on what appear to be compromised WordPress sites, suggesting a phishing or scam lure. The 'SE_CALLBACK_LURE' heuristic further supports a scam-like pattern, although no specific callback number was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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=bhd+to+inr+today PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb4daa043---kalososutimagofo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xajomasonazanovitixusav.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/775bb541a5406eb57b1468ed06b2a097/mogaz.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a389ddc8a14---rugaferukipugodikibe.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/tigezunaxuzamiwexibefu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5420ed7d---45892699011.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/bavewew.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/62735639823.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/toroxaxuwop.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/50322374200.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/xorotetaposeminowebol.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/5368344615.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f1d4483ba---foruzodise.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f07ad202fd5a4014828d05200147427e/wigaxezo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6e168492a3766c7905755e56d7c548b7/mewosuwuvisupej.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e2585e3c9240c861c9f14da9a9b0f50c/karoz.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1f18473bf48717637cc0d928492ef9a4/97118114874.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/k9s38u9t0bikidnj1r7afu7cl7/97959357046.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc353cee9d2---dezufitazukisobor.pdfIn PDF document text
    • https://latework.cz/soubory/fabisagosalafat.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075453c5a439---16915333037.pdfIn PDF document text
    • http://balone.net/_upload/file///12547854816.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607084ce05e2e---90593690874.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c57733c9edaf95eba58b555b3ceb82a2/61573635119.pdfIn PDF document text
    • http://nensi.si/upload/file/vazufa.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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 16932 bytes
SHA-256: 7141acb6ee074acfbaccc85b5a2a2a459b5811e707beac0049b46bb7cad8339f
font_01_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 10168 bytes
SHA-256: 9004fef371376c3addb5a18c873e828ed310d535f62dbee8cac350559e0b3ee4
font_02_sfnt_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1