Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93f89c959d0e632…

MALICIOUS

PDF

102.4 KB Created: 2021-07-23 19:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1fc3a2ad89a5767bc225e52db4dbad8c SHA-1: 2f14f1be65e35ecbccabde925ae0554168bebc59 SHA-256: d93f89c959d0e63283a42da69c9f9b04a89964219ff44ddd6f442cc2ee0508c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers indicate malicious intent, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious or compromised web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9bda0827cf6d3be4cf527addf5986a2f/pamipegizaduwatage.pdf In PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/de0e65b3276f22c9c89da7ea5cc57f97/81997009385.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd975a6cdf0---witanufemijotalam.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2f56a1eb---wepopedesigasug.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082520097894---55941708089.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160986dceca71f---49666059573.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6066f95d---ximalesogejukoxeb.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/givasaferanepa.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8bcd79f02aaf521eba91bc22c4070e61/guvubofaridividiwatix.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c09f7ae97c743480126cb9986da3c23e/benokobifibezonovir.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3270ae36fd---lefavufezogubujago.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/33056798909.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h7v53iep39dhtkj8h1l1ujann6/levidasurosakuzejetime.pdfIn PDF document text
    • http://atek-ent.com/upload/file/luvogofuluxowosakobiwi.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/37124180584.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/39958650555.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/322864355.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f52e76a9bf9e772efda2047511686ab8/kunikiniwaduwuzi.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/tedewago.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/52010833107.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/serogerijami.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/2gpslti8h99o87ro3dem3ghs8c/sanivilivip.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a6ac7913f2c001d63409fc2097752619/14216298525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+long+does+it+take+to+become+a+forensic+pathologist+in+canadaPDF 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_off00012767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 11376 bytes
SHA-256: 2dc6151b33e23b25b2302f0bb4ab4133e54b9f78d6956e5b32e4daa9a7f56131
font_01_sfnt_off0001419d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AF 18928 bytes
SHA-256: c7af09e7e9f619cda7e07686c7fd140ce901047eb3a888b099a16fe56a0d524f

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