Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af6d627562b0346…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 00:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed72372c42c2daf39fbc1150a66540d5 SHA-1: fed3ba4d4c2eb1dd2715e30552d59120eaa7e0cf SHA-256: 3af6d627562b03465a5eb947cb67669b0766fd27c6af4a450756aeb256c5b94f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, likely to host phishing content or malware. The presence of multiple external URIs and the 'callback phishing phone lure' heuristic suggest the document is designed to trick users into visiting malicious sites or initiating contact for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://allytemp.ru/uplcv?utm_term=how+to+unhide+caller+id+on+android PDF link annotation
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/9348136925.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/62406047886.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/6053536655.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/jusetegufobumirobudefiwe.pdfIn PDF document text
    • http://kaies.cn/upfiles/210917042649165831r06iok.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/31685178092.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/repegata.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/57975746413.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/15244920619.pdfIn PDF document text
    • http://medi-sen.com/files/files/novexemidarukapanetadubaj.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/vibinezoze.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/fuzifoziwaxirel.pdfIn PDF document text
    • https://korankertas.com/contents/files/rapemikokopabibez.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/58584308016.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/lamuve.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/34361959852.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/laludutixomawolitetag.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8337f0d7d---63256566125.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/27153574491.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/22246081166.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/xiwuxitun.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/deviwula.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/towejoguvigebirose.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/jubigev.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/zubos.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136a42bed994---74211012050.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/e9862dd57e8746b9805f125746f5db3a/83240909556.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_off0000bd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD86 16312 bytes
SHA-256: 054884432348aaf2ad94e698dd9fd09355a2f0d80800826483ba9b78934cd1cd
font_01_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 10476 bytes
SHA-256: 065dc254dbab9cf2163df7c4626856aabb8819a62754049d3cee035344f61ffe

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