Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a7352392451709…

MALICIOUS

PDF

101.0 KB Created: 2021-06-29 15:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1ab845f89490bfe34e37ed85a24f468b SHA-1: 3ecb3e653221707181bfef99f1e265205d6eaf82 SHA-256: 79a73523924517091bf58c662f03672227808c9538136e82f968e9563a9bb244
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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 http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608244c470f7f---63805411800.pdf In PDF document text
    • https://hmanagement.net/userfiles/file/lenufejugubu.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/97268773609.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0dbc7915165e1904f1e09fe01fc4b6ea/82815341325.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/e5mm4ufult97nu5plraghaff6p/zaronisorolipezujedum.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/59db50a49a7504f0d62c6080dd61690e/kejubusukide.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160770fe85e7da---guteruritejadevomu.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/29737149649.pdfIn PDF document text
    • https://argumentua.com/i/file/devedazexenujanula.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4bb9a2aa8898d449b0bfdf9cb2501bda/60626631271.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/pizaditatikufulop.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/97811812417.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/43507208482.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078facb9c03b---88304548299.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086785f6c3b6---42425935414.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160802f6da1277---budafipuwusa.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6faa91943---bupoxidekuzu.pdfIn PDF document text
    • http://babamoleskine.com/files/file/gurev.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609491947a0f2---18195069160.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/tadikonafefuduwij.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8bcaf4eaf13c36dfb4e1570bf55374b9/vawenizigezimutominomo.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/xedapujusewixinimun.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/f362d9494cce951fa2256a61b8229066/fewagiwaxefunupitisoje.pdfIn PDF document text
    • http://195exim.com/datas/files/gebuliziguxazesetize.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/tosolipiwevezetanis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mechanics+of+materials+6th+edition+beer+solution+chapter+4PDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 11364 bytes
SHA-256: 002456e2cf4cd8fc735208210956e36930da1e957e8ef0ffa850d35499512f5f
font_01_sfnt_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 16380 bytes
SHA-256: 9495f1ce22dd84e81578fb45cefaa6956018c907de939ace7e72ad7e4578926a
font_02_sfnt_off00013477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C89 21468 bytes
SHA-256: 803dcee272cacd60f8f90f8bce22b3901cbf310762fd96ec1a589f5ebcb07c95

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