Malicious PDF — malware analysis report

Static analysis result for SHA-256 4351f3bedeab9494…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 08:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2fc182cf325fb49c482b990fdd567bd SHA-1: 840c934f0d2745ee8cfc6297721591a31a831a2e SHA-256: 4351f3bedeab9494ebc96b26ca4500954623b547d355d935a20adc5cf0e505c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on driving traffic to external URLs, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=call+recorder+s9+pro+apk PDF link annotation
    • https://sukienmiennam.com/userupload/files/zizoreguxoriwepuf.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/xanedugaduribewuvibate.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7598b0b0---57129970384.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/24774371132.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/refuvemurur.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/vuzilusewazufakewasora.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/dofukasuvilusogovini.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613826d88961d---52756605017.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/bateguxajewopajerogujugu.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/61392372449.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xakadigomuluzeb.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/sepulinojivotorizurowe.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/3298326912.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135da34e4f29---57840358059.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/radelejiwijubusi.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/11324841755.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/28713599429.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/ruvugerujikubineluwup.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/57298037913.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7r4m7p8r3r9ld9je2fpc4gq6d3/sewone.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/dukif.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139871dbf6bd---68686630651.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090704323170554.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9010a069d3c0aa7451ca4cb68b908ae3/zuxurulexox.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/80349997904.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_off0000d5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B6 18736 bytes
SHA-256: 443d8b33ba958cffdc4e778a34453bb3a88836622e40d60b012285562d1064e0
font_01_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 10504 bytes
SHA-256: 76c4c5fda68684b2f1c1639c4d19fee1f818f8d67dbabfc9d24bd755acff8a56
font_02_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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