Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7686352382c9e3a…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 17:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 857bfb619031e4e60b986ea8245da83d SHA-1: 23182ddffea86e70967fffc41461e1998b5e01e8 SHA-256: c7686352382c9e3a907321fbd2f373a48c1069db105299f5289af158182e22ff
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised websites, suggesting a phishing or malware distribution scheme. The 'SE_CALLBACK_LURE' heuristic further suggests a callback phishing or tech-support scam pattern, aiming to trick users into interacting with malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://laborke.ru/uplcv?utm_term=download+coc+hack+unlimited+troops PDF link annotation
    • http://www.hebrewforreadingcomprehension.com/content/jezumamop.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c99abcafe---45928034515.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/19013873907.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/32767183673.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/dewifalodusavodelasupirul.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614621d41e99b---bajujoxugol.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/jikotawejivolinopuvox.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/verosabajajavekago.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/lepijijonefipuda.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd22094ca0---dipavelomewa.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/34183606600.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/n9n8tftttnu59q30k7p1jm84q6/wufevawebagajowug.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/25007245098.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/60975595055.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/83687897115.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/gipajapigomizidatonifowe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0612adcb---91554854535.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db2af4529a---sexulofi.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/52760570743.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/kavekixabezivi.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/jaxurabilasutu.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_off0000b17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17F 11060 bytes
SHA-256: cd5c4a7472a7d6e495afcd3d6d4b25544926e5d32a806c032417e3e963cb6627
font_01_sfnt_off0000cb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB13 16536 bytes
SHA-256: c7b44666ada0f4030330ca85b371141a8ca506ce17643d6c99dc9f60de1200e1
font_02_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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