Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3bf3fd80abb5b4…

MALICIOUS

PDF

85.6 KB Created: 2021-06-25 00:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 13f4ea84a4b100ee0f1e82dd5939adf4 SHA-1: e3efbb40f4f9f3b48cc2841bbab59133b362736f SHA-256: db3bf3fd80abb5b4f8a0e0e474b8da3fd2e6b18410bd2f7f712af782cfb8c19d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites appear to host further PDF documents, suggesting a multi-stage distribution or phishing campaign. The presence of external URIs and link farms on potentially compromised infrastructure indicates a high likelihood of malicious intent, such as credential harvesting or malware delivery.

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://catamma.ru/uplcv?utm_term=ikm+assessment+answers PDF link annotation
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609797e221416---nusizepibegusob.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/h06bqfe9ntgonr6rpjcgl979ag/19420863218.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7c7d3a35---89952598149.pdfIn PDF document text
    • https://digireg.com/upload/72021391409.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f0f44b7a9f3b7f54fcfba78f158f966b/naxuzodazebomebulokes.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74886a2479---zalowege.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becb330e02e---dafuxiju.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/gerilijud.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9f2ece5e1---14839597510.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608825943dbb5---4193754702.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/55e8284b9cbca13ab47d30cae0af4737/54844318695.pdfIn PDF document text
    • http://jarosi.hu/files/file/mijakuxiramurusujajo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607761acb1ecd---50048092723.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b6ac4c83dfa00fae5555100913fb9794/meritizij.pdfIn PDF document text
    • http://com123.vn/uploads/file/kemixubifutev.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7dd4891ce5404af25670540e50173166/varamenolijugugadusoxemu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7r6h1qqmfnvss8jcunn1p97mcr/torugimidi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 4524 bytes
SHA-256: 024d38e2f6434576ce4b08f924f75f56df05bed0de9ad3773dc58d00ffe013b1
font_01_sfnt_off00011732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11732 10644 bytes
SHA-256: a4f76a153d9a976c16330e68d4e09851683bf70a758c14c3c5716811cf4f2f74
font_02_sfnt_off00013b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B53 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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