Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71a7d8010637243…

MALICIOUS

PDF

116.7 KB Created: 2021-07-05 22:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 72559b0d3199b739d3b914d8c0a173e7 SHA-1: 883df2e892ef8eaccbedb2d82cdff756f405f496 SHA-256: f71a7d8010637243c6c510f8285c444bef9624eeeb2128818ebb0c448ea4431a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The document contains a large number of links, many of which point to compromised WordPress sites, suggesting an attempt to leverage these sites for hosting malicious content or redirecting users to phishing pages. The presence of external URI heuristics further supports the malicious intent of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://yaqeen-eg.com/userfiles/file/divexudixugo.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/910ecf5fdf3971a4fc79f2ff6f4e5785/19661053728.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160791b65cfe12---3679108975.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/21430737101.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/32ab892392219c1e27f32475dbfa10bc/jorina.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/39928610112.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5e1e26ee3cdd6c8f97b1313bb292e035/36346929384.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ca170792e8de258d18c70accf813d37e/49805254990.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/9ad9486708c20401083389db51051bde/53588953825.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/06qidvpsrvpntsdj6ehh6lpuvl/gopefisamoxales.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/32344437906.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/45544476357.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/52914411418.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/49e1033c39f3e8a72a9ab8de36a1ea31/80707836444.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af7331b5d93---90044404840.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7aaf26ad0389b70257da67d4c20fe0ab/99696928444.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50ab9eeb7---bisidunilo.pdfIn PDF document text
    • http://daebokjungdb.com/uploads/files/zasuto.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/9184790288.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f99672542---sunegofabigulabepul.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/mu35o2k2dtnangr2k5q2neid97/xoderepaxivetevasexojomem.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c111b9bd085---67904337664.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f2406cdf55d1ac9651b69db5ae681f68/pamutazanobonalotox.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/498187b03ad12f514dcec05d6305b334/55345683435.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/4qokmtrjmpuk20bna2bv9rnrho/56229608813.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/498327d529d2c1894167ce02ad06965e/34699530033.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905a638d510---voxizufobibakanesilike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sad+love+letters+for+himPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16983 16684 bytes
SHA-256: 5211a068a9841c74c93c8d2780738a04db9fcd3a4239bd5273e87725827429cb
font_01_sfnt_off000194ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194AB 10656 bytes
SHA-256: 7ac8b75b1ca77467b56339206e020873c075e1354f8cbd1cc8ee50da462bfc4f
font_02_sfnt_off0001ad0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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