Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa940ab0fcfc8994…

MALICIOUS

PDF

69.5 KB Created: 2021-06-06 20:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ed81da1a1d502dc3b9741c4b6b40e653 SHA-1: 8d9c1aaaa57d922dfa31ab1ffb94d760015ff7ad SHA-256: fa940ab0fcfc89943d862582c8c7085389170f413d2466d5f84f6e530ec3daff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point to a campaign that leverages compromised web infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://wastran.ru/uplcv?utm_term=industrial+organizational+psychology+jobs+indiana PDF link annotation
    • http://alpanelektrik.com/depo/sayfaresim/file/dusoxowuriposi.pdfIn PDF document text
    • https://noddy.nu/images/file/guxap.pdfIn PDF document text
    • http://redactron.com/userfiles/file/34484230841.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc2a9d1aa---tituwamekoxuxur.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/0ee9586b9785f895c390d72fa89c9cce/31586831157.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725cd291b49---potesibuguzisexaposenoluj.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wizezosovalexubojobamo.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0fb15e99a3745c2d2773d848562a06f4/37734522671.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/2b3c23908e21189fe958689b894c93d0/73354401938.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e375dc523---jowokojunajibafagu.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/muzopewu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a2eb61aed013b463be8a5904a778b266/22404986296.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/09bqcn80l9i2b05repa1huh3fs/xotukidoxomulu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086bddab9e56---48906433306.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/nibogazejaxazujijuwu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988888b9af9---zixizejitewap.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9e4122f43aeeabb6d7e7877a33822563/38837658573.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 5640 bytes
SHA-256: 07a4e7193bc34d3251a2ed2649324a432fb9efe464b469ce27ef1aa4fbc904aa
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 10764 bytes
SHA-256: 1a17b784e663f35955aea4b483869a7dfdbc4bad0ae5594347fe61baf2fa9001

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