Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e51459149bd6ce…

MALICIOUS

PDF

68.5 KB Created: 2021-05-26 23:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 15df2614bba78a6b71c37ca30899489e SHA-1: 4550c6d64fb6cdd41a77c21f96f5e138d7554a49 SHA-256: a6e51459149bd6cef2f8a6213c9d15df54d7f2713001779be1e78faa10d2bbe9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a34111eb75e---12698642879.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e9427376a6e10ff5092398a4414f98e6/95291030910.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/76ead0b6d50f221b9e735333de46c537/misawapopasigudise.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6d7327e2---72555012564.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/siwowaneximevevidaxazop.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ebcf2a1d---bexazuwodore.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/4aae33a0d6f39bf43a72c21e786cc712/32265012537.pdfIn PDF document text
    • https://bursac.net/userfiles/file/13036274499.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6054c57e5---88194012862.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/61586424204.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/37144d2fb625f29405b9bfdb4ebda268/dofunogafexexokaduna.pdfIn PDF document text
    • http://kasargod.net/uploads/file/22665282247.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084e673670d0---33285280251.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+musical+audio+frequency+spectrum+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 5572 bytes
SHA-256: 8ff4c5247389105ca68d9e50f51f47f84c72ccbcd0d89ed3258437f7d9aaed8b
font_01_sfnt_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 10796 bytes
SHA-256: 7abf4dafe2a3fe1f4ebc9821ce72e6a3abc924552b0aea6c98cadbb9ab4fe569

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