Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcb333eb36b6ce2…

MALICIOUS

PDF

75.2 KB Created: 2021-08-20 22:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a94ad1bed8036d3704313b4f2e55399 SHA-1: a6e1b3c01f5bc888a03be0335b4c274d2ab80257 SHA-256: fdcb333eb36b6ce2c270b14b42e0c66c83b26d29c89f15f06cd33fc99f7c2b5f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and URL analysis strongly indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://kamennykoberec.eu/editor_uploads/system/files/82949092700.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/sugoguniramikuwevibuwow.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/387cn9760r3sr7ejvo0k9ge9gq/80986954997.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/bevemozelibozejajiwuwo.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/ziwozazikufoju.pdfIn PDF document text
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/29165281863.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaecb21e12---45947215902.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zowivudorixalixuboxi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/baratasu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/kl2kqd8aco44gihvntjqfi9cll/88944477032.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa931b605d---voduvurid.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/lilexomopawikabijimut.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/45696217683.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/vajaxetuf.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/sidomonapukepidix.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/13899705947.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/kivapoguzebubatex.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/19685208546.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160969b4923085---vemijufurukipu.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b17b2ab72---80841206424.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/73820642195.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117bae0a513f---46315657989.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/gofoxulorasakiwepev.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a751747f128---44519922808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=9.s%C4%B1n%C4%B1f+biyoloji+organik+bile%C5%9Fikler+testiPDF 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_off0000bdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 18396 bytes
SHA-256: eb162d68494d0687f50909d9244d18a493eee038e1e2f3c5b2f716164c59791f
font_02_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 11288 bytes
SHA-256: ca1f712bfdbda63b83e61f561f9b695d7e141ff13b18561b5870c8b60afc3cb9