Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eeb881c1520a505…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 09:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72a4d28633536d3466336b68990ffb4a SHA-1: 852f9c30433690cd14f91fcbf1e0a867a6ad891f SHA-256: 0eeb881c1520a505dc3fa09229dd8aa4d4dbdb1b568ca3cf25040fc9f268939d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'Callback phishing phone lure' heuristic further supports the assessment that the document is designed to trick users into interacting with malicious links or potentially fraudulent phone numbers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://medvor.ru/uplcv?utm_term=free+diamonds+ml+no+human+verification PDF link annotation
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/72821660265.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/70290873917.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/novikifi.pdfIn PDF document text
    • http://pi-consulting.ch/download/9034223395.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/dudot.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/97507325049.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/fipopatipaj.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/jununatiridewabikuvimav.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/79177457876.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/vakijowikotorute.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b43101b268---jijibokozezisag.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/4190360566.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/57665736171.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/wapizobavapomabuz.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/verokixadewuvu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/30787863744.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff4e23d94---99303141170.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/48411152156.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fatujuvusov.pdfIn PDF document text
    • https://preciseenergygroup.com/media/nadiwufiwej.pdfIn PDF document text
    • http://nincity.de/inline/file/tofedopana.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/9913950954.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/belem.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/40c24b9de5a5b1105c9ca20ae5c502a4/lumilobutoseba.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/29255474497.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/28700620842.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_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 10884 bytes
SHA-256: 4e0cf136e89fb612d794435199e396fea279ab4fab4341f40a4e9fa46575f273
font_01_sfnt_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 16108 bytes
SHA-256: e3270e66345b3bbeae7d13d579623df983d03fe0a015a62a70f2bf9429628408

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