Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec83252fc1939f88…

MALICIOUS

PDF

105.6 KB Created: 2021-08-23 16:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66952597dfe7a9e794766eb0b44bf4ff SHA-1: 9d97f87efb83d87d20fd7d3047ed0d9a4b9fb5e4 SHA-256: ec83252fc1939f88c94b10a9149c37507b1cec0007992caade9ba8fc7ccc41de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including one hosted on a compromised WordPress upload directory. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://cmtsport.com/pliki/82543011971.pdf In PDF document text
    • http://vonschickenconcord.com/uploads/files/4297227689.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/buliki.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/48304960928.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/75316111697.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/jobugoliv.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e8550e0ea15580f659379240e2fa2fc8/pibelaporikigorubid.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9248e3f9d2e6dff40ee79c3c0686d99/rotubugapenumeroxibajap.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/8846683769.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0enbt90tq894afvl12849sgm75/37004145488.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/metamekanazewe.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segag.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/64476913634.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/20157600962.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b547dab42---3418152569.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/zowawiwunekitenaki.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/62057985882.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/iq1mbvpkabgs15que1pf25lbeo/52724746660.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/8921990518.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/20635145951.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/dd7aa57ce87aebc2f30c08249a9eac3e/2976433988.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/17098016118.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/58893600695.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a513831d8d50d10ed9d3869c0a41b07a/8584699123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=chihuahua+terrier+for+salePDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001399c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399C 10340 bytes
SHA-256: da01f66f29d45880ed0415594b79f57a0e626fa341e3b04a37e73708781ba131
font_01_sfnt_off0001511b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511B 17692 bytes
SHA-256: 677f174c196dba16e0620000e98a753322e7a02ecb40e5bc230a5a1394656968
font_02_sfnt_off00017f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1