Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f838bc665a3145a…

MALICIOUS

PDF

67.2 KB Created: 2021-06-11 06:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 41e0a2f9de77487c18593309abbde226 SHA-1: 4bb958ee7743934ba464700e4140aa32d149e684 SHA-256: 5f838bc665a3145a72352a485ccec08216dac979e19d99176cf938d108393720
156 Risk Score

Malware Insights

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

This PDF document contains multiple links to compromised WordPress sites and other domains, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a URL related to 'autodesk autocad 2021 serial number' indicates a potential lure for software piracy or cracking, a common tactic for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 https://synerhu.ru/uplcv?utm_term=autodesk+autocad+2021+serial+number PDF link annotation
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05c6e2126---wikobaxududi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bgqv8g0bptg3t6m70fbn58720v/baripevotapupurov.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1890708328608f50e8d4690.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e8bbce6a---zasubig.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/judutututotoji.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b3577571---devarogujog.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/22086285456.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/kavebowivatopefutufuti.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb14fedaa7---80617977503.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/64580779797.pdfIn PDF document text
    • http://scro.ru/pic/file/muxidokigirikaxir.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/pesuzibilim.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f9c359ab---bopupiwufomogerilasuwe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 5604 bytes
SHA-256: 22a9d4e320ad4dd23b26e14a7b5b15fe4f5575f7f269d49557281ada807ab598
font_01_sfnt_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 10216 bytes
SHA-256: 3b3d1a18cc7dd985139aaf7efdff4198901cc7fe5a5d7513a9b363aca764e004

Open this report in the interactive analyzer, or submit your own file for analysis.