Malicious PDF — malware analysis report

Static analysis result for SHA-256 03467859806c1a25…

MALICIOUS

PDF

66.4 KB Created: 2021-06-28 21:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfb796518d2058fb6168c589c67f4a2e SHA-1: 4b51eac5677138fb08a54d8e0dc2c2ede36616d9 SHA-256: 03467859806c1a2595a59d6be270810af6416abc3d5c5bbaeb74a15d5e0a1134
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample 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 CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content. The PDF structure itself does not contain readable content, but the presence of numerous external URIs strongly implies a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5089

Heuristics 5

  • 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
  • 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://worldprint.su/userfiles/file/66080034603.pdf In PDF document text
    • https://etimes.mn/uploads/files/danifufigoworelidav.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-11/20210511114938543641.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd963d432ac---32382944888.pdfIn PDF document text
    • http://abwessex.com/uploads/files/zajul.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/21522105993.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072288d1b4a9---14685091379.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9898792fd6---45299676687.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c76cdd16fd9---28804439544.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/eac11b226dd24ff9d46c88562ddd21d8/sagijilijetunijepijen.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/55292228376.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082f52738237---75220089798.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe245ae0f4---novidolofimikelilusisim.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/db095c696547cde658b71efc3d29a8c5/vubaxiluboxivutu.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-13/images/files/99459707384.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c5883e77b---forodewu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b490b336b2---74348599804.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8bbj5es33msrsk0cf9ngm2e8u2/98908427782.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/0efd65ec6d16544a5a7013ce63749b5f/wazelugi.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/29267201684.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160723c975c50f---26106920441.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/wewexesojemisivexo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/hoa1eeabuaqfi132p8rq68bimv/betopogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=binging+with+babish+omelettePDF link annotation

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