Malicious PDF — malware analysis report

Static analysis result for SHA-256 22576144163b188a…

MALICIOUS

PDF

69.1 KB Created: 2021-09-08 06:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de1abed0a8cd568599be08f50e6d977a SHA-1: a139aebc27ce070afcdb9a5a91df7ba1bef56e63 SHA-256: 22576144163b188a626d346215b6926b4100b6a3c828dc8380f1232ed6323f33
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to PDFs hosted on compromised CMS uploads. The document body is heavily obfuscated, suggesting an attempt to hide its true nature. The presence of multiple compromised domains and the nature of the links strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/r2nep9ddc5jbbgufvkclqm8k99/39054668020.pdf In PDF document text
    • https://fokusmedia.com/images/uploads/govoxuvorapazexugikola.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/30855927789.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762af6c9c1d---xotekebilop.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/sodisuzukebile.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072db5aa2115---seganazilut.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f32d47a077---duves.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///96507263046.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/40e1ec5d3e441dd54062ecc2ab2aafc5/30613826310.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/wudikepav.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608570635815e---mekifufubovowumorafoliju.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/vogogatebulas.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3b8f05d5---xopulamodumuroxog.pdfIn PDF document text
    • https://dm288.rs/slicice/file/49161331583.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/27556034661.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/5580304604.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/sabexitozaru.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/16068593237.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b511829cfafd0abcd910c5fbf20d5a70/wedariji.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/44093825242.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9fdb4a4db---3208092401.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/juvadodanuvafigoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=torax+enfisematoso+pdfPDF 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_off0000b116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB116 15012 bytes
SHA-256: d81132e11808bb0e72dc023951d3ddeba63a656c8f4826adbfc5debb8ac837bc
font_01_sfnt_off0000d6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 10680 bytes
SHA-256: a352b41061c330dd9812e69233980d9f0633f9011aed38cf23c02d799b5b7416
font_02_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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