Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b772f92b7cb9231…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 20:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e7b6e5f84787e5979a022fc3932db5d3 SHA-1: 03095e80fbcfae9d116684f5ec8f0c6d31c910f0 SHA-256: 9b772f92b7cb92319b93046c3cf2b64f4a36b8a006f564c92a9dfdbb33501401
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs and is flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to deceive the user into a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5517c0b70e37ee10afd031ad457fdb06/94811421563.pdf In PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/zepotolorufisupe.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/57756748886.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/wevegeziwefesatoliwuxamov.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/67118739950.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356dc55dbcf---wetuzafugokowizijebuz.pdfIn PDF document text
    • http://chineseclothingonline.net/File/dukulebirixanimejixonudu.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/jobatoxu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b1fd714e---puxonetidobiluz.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/12949209576.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/78551799160.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/vuwaxebimonokuvalu.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/61931920187.pdfIn PDF document text
    • http://centronegozi.com/public/92485102021.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/6105771081.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613244670bdc6---81392973130.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/70983098236.pdfIn PDF document text
    • http://qdjshg.com/files/file/buwuvogoj.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/vubakezo.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-9/20210909015419699453.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/kizokitonudobujojexokogok.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/kabukesosavonemu.pdfIn PDF document text
    • https://pokereshop.cz/data/file/gisagopuwidasefese.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/76380015488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+firmware+update+tool+for+pcPDF 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_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 10780 bytes
SHA-256: 8442d410b27d75184928894f917634a22c32f8842515d9eb0e3138258179f8f5
font_01_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 16460 bytes
SHA-256: 1e5e74a4b2087f0f490d4c06e02126510a33dad4e37224f515e22b0d766d8039
font_02_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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