Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d76afdc0ee61ec…

MALICIOUS

PDF

81.7 KB Created: 2021-07-31 08:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6897383b410084a3a0cb3453aca16bae SHA-1: 1bf277e1cbd71420b81a5a07cb55e7b058b7ab3b SHA-256: 91d76afdc0ee61ec484f5e8c78ea55358be980e8f3d3a1d96f951973a11d8c51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attempt. The embedded URLs are likely part of a campaign to distribute malware or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6aef0617---47079140296.pdf In PDF document text
    • http://www.bufolari.com/public/immagini/file/sawemebixuwujogiruzoruxo.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/gatapizijavo.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/pivarugebosejalizopar.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/29132226665.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/wuzubipuz.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243df672f8---11471133186.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/l5h0jdv9kvjns88gio32tjmkv2/14079865572.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210605101118.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/35708025570.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/16270867267.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1662a71f46---67477421707.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097b75bdd5a4---99064027235.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/21287030576.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/fapis.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2867d51aee---21029711432.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/74355398719.pdfIn PDF document text
    • https://hirurgija.me//files/vurigaj.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606da01887ee1---83297574333.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7fc3cacac---76193254550.pdfIn PDF document text
    • https://mmszke.hu/files/file/miguresukobekexabej.pdfIn PDF document text
    • http://habibitours.org/ckfinder/userfiles/files/fagomusuwusavozupatujawo.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/xuveziwen.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703bf796623---75242746118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lista+de+chequeo+para+auditoria+interna+iso+9001PDF 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_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 17396 bytes
SHA-256: b4c635d898997ca3fbc98a0143bd468b551ce0b7ce7738570b35080f0915d1be
font_01_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 11112 bytes
SHA-256: db00b46a62630652faaa4619965431c1d381952846c831736ae6d77cf4bacf8f