Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f286f7f7ffacb96…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 07:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c2ec14b1dbc83d38f9b4123a2179d99 SHA-1: 21a66e635fc352f2e4a732238b09047c83faacda SHA-256: 8f286f7f7ffacb960a778b067490b705ec44a9142bc6665b0f588ee3bc1b77a4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. Specifically, it requests recovery secrets or private keys, a critical finding. The document also contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content or redirect users to phishing sites. No scripts were extracted from this sample, but the presence of external links and the nature of the requested information strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://smidgel.ru/uplcv?utm_term=ars+goetia+pdf+espa%C3%B1ol
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac353f2d9f---16259380637.pdf
    • http://gyndoktors.de/ckfinder/userfiles/files/pazob.pdf
    • http://astmasme.com/userData/board/file/59080545565.pdf
    • http://innotack.com/userfiles/file/xudumen.pdf
    • http://bright-inter.com/file_media/file_image/file/tuvofuxigebowirasi.pdf
    • http://skolky.info/foto/images/file/19415069128.pdf
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/xivuzovodesubatufi.pdf
    • http://akademia-jedenastka.pl/zdjecia/fck/file/rugedinavibe.pdf
    • http://pixel-pro.ru/upload/file/kowabazijefamapezitamel.pdf
    • http://moveworldtogether.com/datas/files/pukazakilibigalixu.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d2e8e92a0dcd5cb5e82dd1f624b9374e/71212140958.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/834b69db528e4136b3664f51268b82e8/kixuvovifigekeboperowin.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb26905d74---gewexaxobokotoviv.pdf
    • http://asiavent.com/UserFiles/file///21285436487.pdf
    • http://veterky.ru/ckfinder/userfiles/files/60595988548.pdf
    • http://szjg.hu/images/file/jorimiro.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1f0f95372---24514324216.pdf
    • https://go2germany.ru/files/file/57364106732.pdf
    • https://ambalatender.com/upload/files/70153228050.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4t1bc477e61de438e3rt6i8sv7/kezorefuputaka.pdf
    • https://praktijk-fix.nl/userfiles/image/file/26733080466.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161445d7ea2393---powoxozemamasozakavesew.pdf
    • http://reklamaopole.pl/userfiles/file/logajoxukumerugeximobowo.pdf
    • https://kalimati.in/userfiles/file/xularovikafisove.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/82296571861.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_off0000b2df.bin
b0da5a46263cbdef3ae590845b02006c4ec7533ee9e2ce7be490e54432c711bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DF 16416 bytes
font_01_sfnt_off0000dcf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 16792 bytes
font_02_sfnt_off0000f50d.bin
491c06554df60943f1547c27ebc3bba0cec61cadd44f1bfd4c04e6c0b11f58c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 10756 bytes