Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c37e11e872af5f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 02:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bb82a43e1a312b26cec0a24a0c95fb2 SHA-1: 59023213ff9f64788930b3ef9ade2782f6996e3b SHA-256: 16c37e11e872af5f3942e07e5f025779f7caa47d32f45056ff1d62aaec89c18c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on compromised WordPress sites, suggesting it is designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the link farm behavior is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=tchibo+cafissimo+manual+romana PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d3647534a03d7237421fa9955c58a30f/fopuzatoz.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/20797074286.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ba0a1cac1f52494c0ae92874cd863fb4/89153168376.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/35365335745.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/88283494345.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/jeraroditewi.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/xedusivuwa.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/47165123841.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/vofaresezodeja.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/17920010242.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/laririxawevomutobizo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608702596af7a---77693628666.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bcb0185bcf---99248529479.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/57010234336.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b297b4cf66---66443592342.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833c2bc086---wajubovibibafunug.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607582b48eb2e---28510725985.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/batoremuvukitidopadokem.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3796ee281---61993759159.pdfIn PDF document text
    • https://kuepancong.com/contents//files/78200200156.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/tapegudime.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c238adf48---41350937508.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/rakabide.pdfIn PDF document text
    • https://isleo.com/i_photos/file/masimevimis.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/lorepid.pdfIn PDF document text
    • 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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 18856 bytes
SHA-256: 9ba27ebf9ef7e5eeaebbefe56bca4c52e2106b4c1389f6a6d7da64340b000a0d
font_01_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 10576 bytes
SHA-256: f05bc688f2cd30370f1941a6924a184c6ffb269b2f04e62c5d55ac00044e5167
font_02_sfnt_off00012383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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