Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aca3470e8f41644…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 16:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c236764153da61466e8e9f70c8b516f SHA-1: 24d28f8228858a60a5f6f7a7d1301ba09457ccb5 SHA-256: 6aca3470e8f416447d9c4fc1a68ae4f0c323feedae4ad0c7f0e4a51b066719cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://treasurehunterdetectors.com/ckfinder/userfiles/files/repanawusa.pdf In PDF document text
    • http://maciejabramowicz.pl/upload/files/file/41054959113.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/ruxobe.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612044e1e3b34---jodibo.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/vutomo.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/nuxuxubotugevizikopuzozum.pdfIn PDF document text
    • https://ancoraeducacion.com/images/74561624975.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/8645495844.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610a121919e2e---fupurizekasobigujura.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/05fc98c31a456cc8c2cb03fcafc3f284/4350566134.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/22725728362.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4750ccb2b7---sodalejilo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c97dfaa9634---vebobuginenopexegix.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/pogagatinoxabibubivodono.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1bb24667c---sodojilowopemivebojerix.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/48802987665.pdfIn PDF document text
    • http://lex.tj/img/file/rufisakibupeko.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/sixinokibesug.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/rotinuwogis.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/luwukavizufanawa.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/1de22ed0a70ccdc3e185cb70300116a9/kebujixi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/jatuzogitumubavozid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=human+excretory+system+pdf+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 17572 bytes
SHA-256: 0d2e8a9a39ab70b975ccc51b427e61e1f696173d6f86642198e9920c6a14127a
font_01_sfnt_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 11084 bytes
SHA-256: 3afbbd0024d9fcfc4cb9d01acc33e211eca60f0f867f6051c174d467cbc41b03
font_02_sfnt_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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