Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bd79c0509254b8…

MALICIOUS

PDF

80.5 KB Created: 2021-06-17 13:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0e81e4ab0fd6ccc604407f524699515b SHA-1: fa96416637301dae4d9dcaa43716ce96c7b37ff9 SHA-256: 56bd79c0509254b8a00916bc25ca311704fb1995f644afa3dbb26a4f806d47f8
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 contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=ballade+pour+adeline+piano+pdf PDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b1af23798---21544608943.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/jafozefabura.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/4138027cce18bb29259fb957f02a4752/93398466374.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074755dad5e6---papavorewi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160789877c2471---60638619264.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608975b8e5674---23599668550.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/l019khv7b1bdapf21v9ubqk90v/minuzumikajupokimeluxo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd46d768ca---59677492145.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/tifusapovijot.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/goriw.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e90c237d2b5feb58cc69b8a6928eae4e/14883729978.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fb4fa5e08e2e4b3048f5e0c5651d2dc4/zesidegaravakiwenul.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/39fc55421e3737b65ff5810110cabc74/36732018740.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/etcfe9dqbolionanoi2d5jrpa2/kukigiwedeponoroxale.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4c431abf75485574a9be1e8b85427c06/janum.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/vae0j7drq3rqkdk28aak4c6lt2/kebefusebogonujazoseg.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 4908 bytes
SHA-256: fe6507316e73345c6260a65a5d89d9c41f0373363b9e68f4b1764934dc44e9ff
font_01_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 13140 bytes
SHA-256: 587b1adfa1650a1a7c5b4eb1d7832dd339dad44cf049415d0f3c68d10f798402