Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea4ba6aecd395b2…

MALICIOUS

PDF

86.0 KB Created: 2021-06-09 12:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 446f729d51da2abd9c614dec14f9f6d2 SHA-1: 6dc8959237a3c047aed49ca8e45ebb990e570344 SHA-256: cea4ba6aecd395b2a57a5db0b0670f545a7e694f3ae3a6ffe96aba297f485eb4
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. The document contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The embedded URLs and the document's structure indicate an attempt to lure victims to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/uplcv?utm_term=biggest+live+concert+ever PDF link annotation
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a84212dc3ab---nemejitozov.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/a3d9eabe69f7d5c1e4bbb6b4b00ab084/dakexudori.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faacbcabb3---monasaladeloparerupiv.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ma3jo2o3r472srvnkhdt13h6pl/91079641846.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/psa4fhvkof9ak8uh4uvvq4ese4/jakipubuvafoki.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8228b0c61---gemojafudezon.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5ippqsch3v4575ooe6v12vf752/sazidozemoxeriza.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8ad1412aa520f0ae07f60526cb23d426/48242423881.pdfIn PDF document text
    • http://soupworld.de/upload/file/suxofusezasonul.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/1e8av3ak8q9c9bf03ae0e40oo7/wejafafewux.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/76cee134682082f96305b07ca7c63ccf/xifewulixebu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3628e25a8b---zejutizerowebubewakekusaz.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4589723c---94663435157.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc73bbf8a3---32308117579.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/vbdn7t1eeajnec25dbvocgvmk3/wuwugedagejuba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 5932 bytes
SHA-256: 3b374074cf61e483aab6b057971fdfb56e4d7d77e6deacacbdf6095aaaa61997
font_01_sfnt_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 4868 bytes
SHA-256: 9c64286fa0bfbca602196fcb1b745436653222873a5708a1c99f4c6f7c3fd633
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 14200 bytes
SHA-256: 3a95150abd3b27f3c4c9d5b9312457ea1a6691d8e8728c4643d5056e1f3c9490