Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82eb62bc1ec1a17…

MALICIOUS

PDF

94.7 KB Created: 2021-10-05 07:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d3002f5bbf0f53a08b5ad296a080fc8c SHA-1: 13cf1e04f9a9231d613619c67f2d80e068e8759c SHA-256: f82eb62bc1ec1a17ed238e2141d1ad4e7a9aa24ff3390a811e1b5a05364a9ce5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of the 'SE_CALLBACK_LURE' heuristic strongly suggests a social engineering attempt to solicit a phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cjmfgxfollow.morefriendship.com/upload/files/48467992796.pdf In PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/91764728311.pdfIn PDF document text
    • http://fkhd.cz/data/img/dujojumunemunafiwefokexe.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/45671828591.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109071312333974.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091418000173499.pdfIn PDF document text
    • https://dynasty888.com/image/files/20211003_175823.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/kuredofo.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/8523239049.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e26b60bc9d378b9a1fd18f873b9b8ea8/vujafibare.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161527e80a3e89---67880344757.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/91793745552.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/98502750861.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614f547234156---20617229289.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615a2d0bdf6a5---13018697630.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/80040010783.pdfIn PDF document text
    • http://simoncaulkin.com/images/zapav.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/br2o9h6tpkvv1ulsu2lvf0grvp/58534169430.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/fugowadexuvema.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/40322355592.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/65652196110.pdfIn PDF document text
    • https://foulardfotografando.it/file/fuzomafifubomajomubo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614832b424e6e---3884872502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=health+outcomes+by+countryPDF 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_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 10748 bytes
SHA-256: 024954e9a16fcec2559e181bc56093f619c45e3e2f306b6ee7caa4b042a695b6
font_01_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D8 20424 bytes
SHA-256: 40b95e678cfd348562122f095dd7f028d31858af2cabf271f97d5946644f459a

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