Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a11d2675bfc38c1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 09:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36e42425d527e65c8c9493e108625d4a SHA-1: ba62dde6d3cacfd4292295d597dcc960e8c36dbc SHA-256: 6a11d2675bfc38c17f13f03ab8512c44f61449d393f7f4b34a24920035e8e8ae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into downloading a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=inhalants+drugs+pdf
    • https://zohopin.com/calisma2/files/uploads/22595205257.pdf
    • http://afghansolar.com/userfiles/file/zivogokomimutaxomaju.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/19530440658.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160716b521a63b---bugevuribuwofi.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaeda0641d---63055807795.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b7edbd1d1929b16ba819b506392cf286/571837628.pdf
    • http://vswet.ru/f/viponerebisuresog.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hd8m1bilqc2s0fctp1go7h57kg/lokanotovosiwuvaloxe.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6gfn8oan1sqdhv49s22n8i8kpu/geruravikesivitozip.pdf
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zawaferarezig.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/rutiposo.pdf
    • http://laureysnv.be/uploads/files/fakefurejivilulelimotom.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075982580389---konewifovawomisaduko.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d72557c75---92933964268.pdf
    • http://rolmech-strzelno.pl/Upload/file/32424516733.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/0571ea04782138ca971101f59324edd2/lawakomuxose.pdf
    • https://ht-cooling-j3t.com/contents/files/vozudemuf.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/f3tr9nuoed87irhggsqn5lu802/rowirobebirabutama.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c89ccbbff6---sogibaraj.pdf
    • http://americansemitruckparts.com/d/files/97307471065.pdf
    • http://www.allatpatikapecs.hu/images/file/nutiwadugoxetowizapejitov.pdf
    • http://atrsara.ir/resource/files/21235102160.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d40151e4e86---6961199219.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_off0000d314.bin
51f0cc9c4d38ac2cc63f65c4f75d97875e95021cb67613ba86dd4278c5ea0f1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 10484 bytes
font_01_sfnt_off0000ea93.bin
8961650932ac42cc8501a15c0fc0e319c26b02713358fc6a12844aafe7c6c013
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 15916 bytes
font_02_sfnt_off00011362.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 16792 bytes