Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6da083dd76c0e1a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 22:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 770590b338190d9a31d33dc7505d7567 SHA-1: 0a2e8465136af97e1305433de4c13416bfcc4216 SHA-256: a6da083dd76c0e1ada2ed0460a7f1634e0f944494801198ebc305cd815cc388b
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 it is likely a phishing or trojan delivery mechanism. The document contains numerous links to external URLs, many of which point to compromised WordPress sites hosting other PDF files, suggesting a link farm or SEO poisoning tactic. The embedded URLs and the nature of the links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=microbiologia+veterin%C3%A1ria+mcvey+pdf PDF link annotation
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabd5c8c38---nuwukupela.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e90de0635---38991972063.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6b5ec56d9---vogifotorulisivoma.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/mejebikajenisisuku.pdfIn PDF document text
    • https://inncredel.com/uploads/nalafilufip.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d93596a77a9---tukokuwifekusituriropib.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/pitajagejalonagikozerom.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/kuzaveroratilesoforonir.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/32458501971.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/20732688220.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085bce8f28f5---8405127539.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c676e223a89---63389257564.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/96487bafd86e303c3ece0cd33740b22f/83456065328.pdfIn PDF document text
    • http://hidropro.hu/upload/dutigi.pdfIn PDF document text
    • http://vce34.ru/attachments/file/kajafuzofoluzenavob.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdff882c85---11631504016.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/zupagojapajaze.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qutgt0miokie2itlgd3ko7fevf/koweluno.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/joroxureraforuketonomuvi.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/7631684672.pdfIn PDF document text
    • http://k1a.ru/images/files/file/fipanor.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8b7536b6795ec9f2a6398ccb81811a27/nijumevajewevopasozux.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/50a2795411b32c3a274cd89a4577e5c7/xabafekek.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/kenowijojetozazamibelepus.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_off0000bbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD7 11288 bytes
SHA-256: 714064d6ac14f1d9d437cbb55b9c8cf7b7ff6a1d44d576572ccf4aed962171f0
font_01_sfnt_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 18356 bytes
SHA-256: f7d50bb76db331ea9e5cc2d7da26afa01e04adafb532317de5b131a35b141fcb
font_02_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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