Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa05ca72860b344…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 16:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 073ebc7dc3439aee32b384dd648a03f9 SHA-1: 2b484891ae7de997ce2daed3773689ee458e2424 SHA-256: 6fa05ca72860b344e78c782dfc29981faf8a598429deaee43f3444f1e7dc3278
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=android+app+development+report
    • https://plentis.eu/ckfinder/userfiles/files/judew.pdf
    • http://sayarbobinaj.com/file/30229620899.pdf
    • https://nikosdimos.gr/userfiles/file/nipojelilemuba.pdf
    • http://unicaconsultoriarh.com/images/files/wakebugup.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/72735011869.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614122626b930---82999198357.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80861636810.pdf
    • http://abwva.com/uploads/files/lewilavasefovogesodebupup.pdf
    • http://www.europesolidaire.eu/userfiles/files/pilegejurisajuruw.pdf
    • http://teamtrinity.net/trinitya/file/83300212243.pdf
    • http://yanarfabrics.com/firma/files/wizepudegunugakebe.pdf
    • https://digireg.com/upload/bozalatoroxogagorusakukam.pdf
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/83599684061.pdf
    • http://autobedrijvenindex.nl/images/uploads/1388180286.pdf
    • https://armature.ir/cache/fck_files/file/gomajosokebum.pdf
    • http://lamelove-zakryti.cz/userfiles/file/84832451676.pdf
    • https://myreply.mobi/snappshott/editor//file/33657441347.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/10428284671.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3b3c2082---sesofuderuketobi.pdf
    • http://biurod9.pl/public/userfiles/file/11949045796.pdf
    • https://vietrocknet.org/app/webroot/img/files/35734591971.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a99481df7---29557559880.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_off0000e6bf.bin
0c2aad54eec525f6403379f84a4414d730bdada4c509f162bf69ff03d8c5aaa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 10432 bytes
font_01_sfnt_off0000fe53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 16792 bytes
font_02_sfnt_off00011665.bin
de9c9c0be17bb38caf78cef40942d6f75eb6123be05d865a06c55858283de6b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 18964 bytes