Malicious PDF — malware analysis report

Static analysis result for SHA-256 728d5a06c178223a…

MALICIOUS

PDF

78.7 KB Created: 2021-08-09 12:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1effebc71927132e0dacb20376d930ea SHA-1: 29c4f5cea65632978e80b32b3c7a8473d2da3501 SHA-256: 728d5a06c178223a9d33983357d94dc30b1a5e499bb9673fbd35968f5bb114ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to distribute further malicious content or for SEO spam. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the overall heuristic profile strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://tranthachcaodanang.com/uploads/image/files/44287357099.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/bivi0huufiuh53valht4jn8pj5/zizemomuk.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a59499f7a---96749664546.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1626097121.pdfIn PDF document text
    • https://aneri12.cz/res/file/gopawusodokijevaf.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/zoleradig.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/bojoxalibulexax.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5091c44b954025418a5daa6741b177a7/76507407157.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/15721020710.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5521d231d7f59cd7a63ae2e5175f0c89/68535273338.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f2f64003b---70452388369.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070702e7e01a---fosaputedozedirurojepades.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/jubumexatifodute.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/19726733867.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/jasetupezalimed.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/66377885222.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/lokamirafavuloni.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/k63jibveot3edr5b7jiduod3mk/zavalivir.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/rozifuvexamavuvawib.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/timera.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/podedubenut.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/8dbc701f0c2e5df7067a8372c7c72377/17110392683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+approximate+thickness+of+aluminum+foilPDF 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_off0000cc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC56 17048 bytes
SHA-256: 08f0058b8ecf6a35604aa896305edddd5717aba56d86a6951bd16af20c412904
font_01_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 11032 bytes
SHA-256: b5667aa25668625bd09537818e3eb4ba6c354ed2c6cb89143972fd11da8dfca7
font_02_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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