Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bf662e8d8f0cd6…

MALICIOUS

PDF

82.2 KB Created: 2021-07-01 19:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e820c1d08dd86e8301408ec32f5bd660 SHA-1: 43456a2423229e439c4db4c24be28b97524eb782 SHA-256: a1bf662e8d8f0cd62163aca2bd62645231c7568f6eaf13650b97226dda22e93a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, specifically targeting file upload directories, which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e480e6aad6---todasuronok.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/fac7cf380bb092a3406c94abffb0712c/devoj.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7afd55926ad8e1831b101e8343083a1e/6293608249.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f8652d12826e5e54bcdd3d78ce956a38/4715336160.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/5g48qfnjvtuavd9m86c18pu0h4/nusizejigasinovemolute.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cba689c04a3---bogajogumokinenexun.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf055c7d8---33425927522.pdf
    • http://resortvillairene.it/userfiles/files/sazifebogizasogaforagupa.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d5665c3f7eb7800886b22589f3907b60/21546379789.pdf
    • https://ludifrance.fr/userfiles/file/40460420124.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160742704b7042---72915768042.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/bozenanoripo.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/zivovakigetozoxofewe.pdf
    • https://rubenoferro.com/userfiles/file/18319541344.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4ec98d205d97f6cdb660520c6a0af882/jigobipuzafelaje.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3a59e5fb0c9e089737b507d455220e29/ludijozalaf.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67059f552---91543865354.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607172182b642---worapiwabezenigaberu.pdf
    • http://jingluo.net/uploadfiles/files/24704021045.pdf
    • http://saovietgroup.com/upload/FCK/file/nipoxadibubidaxovuzalotu.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a631afe7946---99477765588.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sql+group+by+tutorial
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df56.bin
d5f38f29b6c4df9ddfa70593b2bb50ad0231e092797f22eab0e91ebee4556c53
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 10596 bytes
font_01_sfnt_off0000f72b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 16792 bytes
font_02_sfnt_off00010f3d.bin
14a52741ce5a8fc49f96dea9a23ab1d038b4628e8bbd1924146e12f182b70953
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3D 16636 bytes