Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6c31a736a94c01…

MALICIOUS

PDF

92.3 KB Created: 2021-08-02 15:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 06826eb3101ba5ebd20e6dda0e28f9f9 SHA-1: c3d7857fead9dc5c6ab96820bcbe73bd03e49534 SHA-256: 8c6c31a736a94c01896b482aff13d68467db35bb2ffa1296feaba6023e6e4f0f
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 trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further malicious content or conduct phishing campaigns. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=manjaro+terminal+commands+cheat+sheet PDF link annotation
    • http://cs-web-design.de/ablage/userfiles/files/78456388265.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/bpkbsapsj7pj1fe3sv2guhu5s2/73998668558.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b078b25ffd0---46196786209.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/60842947373.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/zasisudovazirerulekikexi.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/sj1i1bu5u3d0dqcl01gqjqad0l/52670239429.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/domarevanupesupola.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///48158102528.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/jenuki.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ebe595114---xudaveroxow.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/fepuwelitunojumavojowutak.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kumoz.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/tenavovezakexazen.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/niveromuxadokosedomufeli.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cf8a8537ca747ae3c4831cf6afcaadc2/jokowunadusugaw.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/48511141893.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607285746544b---766939482.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/90387973428.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9f6e0cba7---11464420500.pdfIn PDF document text
    • http://akademibt.com/resimler/files/labukosuve.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/80274724783.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/ranunitadudon.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/xatosaku.pdfIn PDF document text
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/bededukaneguposerekijinam.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_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 10756 bytes
SHA-256: ac38a33b165e8fe6e3e18b9d8566533ff4efc3f46e44f84307594440fcb895fa
font_01_sfnt_off0001178f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178F 19888 bytes
SHA-256: 76439058e5c4dc568dc738114901c1160386eaeb14a2ec0aa89269a52a97f219
font_02_sfnt_off00014b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1