Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3efbe400eb49af…

MALICIOUS

PDF

74.1 KB Created: 2021-06-26 16:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f904548036587664b20d0f4aa255dfae SHA-1: 574815426691a52ca62a0ed58c5fdfd2d230891f SHA-256: 3a3efbe400eb49af80612e6708f941a88b5b0999c673ee8967f13bfba1db3f94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://chcial.ru/uplcv?utm_term=minnesota+borderline+personality+disorder+scale
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/31feda38257b3c7258b0a73c0c5e0acb/pibamaxuranuri.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfe11da45a---lavonilofinoluwelebir.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/574687672664673b6f4d6fcac4cd55b6/rajuwososinuporuze.pdf
    • https://banderlogclub.ru/Files/file/49382942988.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d412fba971f---43792668063.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e47589ee---nazovesolu.pdf
    • http://matstravel.ru/userfiles/file/maxebel.pdf
    • http://pensionpoint.cz/userfiles/files/nazejebigi.pdf
    • http://dyglas.com/userData/board/file/zagadusifolonese.pdf
    • http://malabarisproducoes.com/arquivos/files/31685037464.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/oc94pkc2od3b3k2untmrp043bv/57348334628.pdf
    • http://ambvet-trefontane.eu/userfiles/files/49553775837.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0559966b8bf0c7725a100ee1489abcd9/paberet.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/0eqankotndnsopccvlee25fi8l/kiboroz.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eee7cf6c6---sogenofetesiso.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/db660a785f10be45cfe2f2f8d0cf8fe4/fawezekoxagalofudakaxo.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/9246a412f838cf74f3a18e785972697f/27201594126.pdf
    • https://atlastoursntravels.com/userfiles/file/52388857475.pdf
    • https://gachbinhduong.com/upload/file/fonisudoxutakebekovim.pdf
    • http://arslanemlak.come/file/mojubuzizirusefijex.pdf
    • https://hosvagyok.hu/userfiles/file/jofiwadevotososola.pdf
    • https://uleshuzatabc.hu/files/file/58660536894.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/75742235364.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9814f2185---debilujudi.pdf
    • https://ideylia.fr/uploads/file/59863766501.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e99ebd3f---vorajewodazarivupaka.pdf
    • http://animationcoach.com/userfiles/file/bojilagegijudizakimi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf3e.bin
4577d2e6924197d7686722f1b244992e3995466bde0d363a317dce165286057d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3E 10752 bytes
font_01_sfnt_off0000d7ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 16792 bytes
font_02_sfnt_off0000f001.bin
ab45a48d726a7fca3c46b6f5bfef15f00ac8a171a2a7f47e084bbeceb7c40f5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 16444 bytes