Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b04e4efc2fd5c3…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 18:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0171d903ff66db507864e2fe1a1df58d SHA-1: dde1159316bb75a1aec6dab66654f5908d8089bf SHA-256: a2b04e4efc2fd5c327b7e060eb9f0df153e349c92ca6ba7dbae9b24645bf4da9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely to lure users into clicking malicious links. The document body is unreadable, but the presence of many external URIs suggests the primary function is redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=endress+hauser+catalog+pdf PDF link annotation
    • http://boeschfamilytravels.com/clients/43210/File/84507473437.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b6a747899---lojosumokawotima.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc05ebfcb6---69601250586.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6oas1um1es6ri436m9sv567jhb/94170540956.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/texumadopomuz.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/tofodiguxewar.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/kilifazesogima.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/80581664099.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f2c0f88c---49409950039.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65867048fe---jepirutagobajiresenuxemad.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/mekipivonelosateku.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/18669862880.pdfIn PDF document text
    • http://msiutilities.biz/documents/nulotiririmigumadokavajo.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/31594103628.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3734d98ae3---pisixibanurasovedate.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a17d7643100---57335116940.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ddq61nr1in40793kfdqivkuk50/jusazojibewevoxojogof.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/soravuleturamofamivejo.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c957e7e7ee---3842428617.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d73022e2a05---wagawusev.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/masotizukape.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_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 10892 bytes
SHA-256: 2fd7ca007bc50451c9cd9471c7157554711a99345fedee5168cda5737175630d
font_01_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 17644 bytes
SHA-256: 9df94989efb906702b709a89834d00514250514e37fd85e52a8f1814c37107f7
font_02_sfnt_off00011b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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