Malicious PDF — malware analysis report

Static analysis result for SHA-256 307e9cca856754a3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 16:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e66d94c07cb2c5b77bfa6fb49b53712d SHA-1: 01b05836334aaf4f1bedd7b247dcffe61246e094 SHA-256: 307e9cca856754a3ebef01b4e24da7596e71dce3f5e8f0c506ad1cf57e55f4ce
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links, including one with a 'utm_term' parameter suggesting a lure, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://windscrm.net/files/file/kifezaj.pdf In PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1887a7b3---fezejowuferofajezi.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/dujetimeruxavukowomatonem.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/1590196240.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8147b1807cc63d98d2add3a14dc8c172/80598686728.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/20725162009.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/76138207568.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/16000681472.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210901045553.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/37979547403.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/zizanepewawepo.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/lurakipunixotonazibi.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/rosemovefetegulezepofol.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/41442650879.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/88794881873.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/tekuzimitapexibowaxavepez.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/3854571938.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/32082690210.pdfIn PDF document text
    • https://webmenuplus.com/images/file/12224187598.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba436309be---58481785976.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210905161719.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/xolunitobojefifusogusoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mortal+kombat+android+hack+apkPDF link annotation
    • 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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 10704 bytes
SHA-256: 7808256b01764996cbe3228184bbfbe2f01f72797941e587fc92864ce233185d
font_02_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 18080 bytes
SHA-256: 4dd26a4b12cecda89cfadab168d75348fbd2c1a55a39d68abf2b01a9faeb0025