Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7431862319e5baa…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 11:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 60264b588e4ea4742baecd8b68f7148a SHA-1: 4d7956397f75470cbe3a5f3fa1fc588ea12559d0 SHA-256: b7431862319e5baa472a83d5598869a2a2862e1a350ce4354d57960ee77bc60b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or redirection scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of potentially malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bff3efcfef4e00c1a6a877e165fce34b/12800716067.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1084477b5---47118996914.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/59a7048e3bad17972554b2dfe5d01f99/nejikoxuralupe.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/dajiz.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/08c0303d948ea85960d6e61025a48d1c/kovogokogep.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/xudero.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608539da01b26---kugusonav.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1e3effdde88cfa6ad4bc5d257e63ca09/sagigo.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/4qmftn1r4kgclsdb8um4m4ql8p/favabovetexiwa.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607092dcd3ffd---50822106174.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160904ac838fd8---pegavasejujujazopax.pdfIn PDF document text
    • https://ive-cal.it/file/5521814092.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/gonulewuruvirapidib.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/23096723834.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vmv0lp91r61d6d28qs50gk3c2l/nanedomuxonogiza.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/94784745389.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/4d3ea72b6cf4a165589f2f6fee8d146f/sexilesidovazuselubefela.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48c848e1b0---61134681028.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a984ebad46ecf2f9d455fe760793f9ce/jolikaguradodam.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/otoc6gokuts1q46pfp1ld2ntg6/34920622397.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/u3cos79rlcbqfnuo930k9s7l1f/wijofa.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/wedisugig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=liverpool+quiz+and+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 17420 bytes
SHA-256: 1fbdfc2485b79048b45c2217c7a72ec85d58c400651fa2b2ef6454702ccdb4df
font_01_sfnt_off00011cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 10704 bytes
SHA-256: e3a4600135535e5cb268ace4d640317a5bc378d0d9efa304a297262dbfa6b89f

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