Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b3556e9c377d82…

MALICIOUS

PDF

123.0 KB Created: 2021-08-08 22:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f66f8bec40b931ebe292384944603eba SHA-1: 635c252c2b342f1da43768ce7f9a0fd6f0f9add0 SHA-256: c6b3556e9c377d82a2c0e6453cd0445c288773ba4f14c32e71e6c0afc7ba839c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/o39di2e8nrk279d72vlqg13243/68863843755.pdf
    • https://avigailpekelman.com/sites/default/files/file/dodagatepebogakonuw.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/879ae2a21e55d3a450a249f0c59b4f08/puzosoginurenadelowof.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a017515f142---8341898254.pdf
    • https://sayurmateng.com/contents//files/wojexipaje.pdf
    • https://ddc-touggourt.dz/ar/files/goluxugozugixaremum.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4a82b7b18e1f5f768566628390645e80/63667768775.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/64710281195a7a3b6be41687e5ab8fef/20177948292.pdf
    • http://lacasedescaraibes.fr/file/902551698.pdf
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/44711528076.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160807753de576---dovagakopilojob.pdf
    • https://murten-hotels.ch/userfiles/files/jutuxa.pdf
    • http://aarogyamedico.com/userfiles/file/20219817767.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e55f8faac2f---bumasizuzowexina.pdf
    • http://fine-cottage.ru/userfiles/file/xigatefano.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/94519774100.pdf
    • http://crmrealty360degree.in/userfiles/file/kizizofebumona.pdf
    • http://mosjob.ru/images/file/tinawiloxuwamuduw.pdf
    • https://airflow-skateboards.com/userfiles/files/23528765323.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/sobesamuvovadolamurewalop.pdf
    • http://verypool.cn/images/upload/File/tolefijovuwo.pdf
    • http://acmemask.com/upfiles/editor/files/tuverowaxominokofatexirip.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fae3c1473---korisimomajosixexomizugaw.pdf
    • http://naturabliskociebie.pl/userfiles/file/mitawujapoladiberegeteni.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ct874rh0fmps6jgdpdk8iv0rnk/67368936720.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=surah+dukhan+pdf+dawateislami
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016727.bin
623e55458bd840f3a5121a72961c6873b62f8f85957971ffb52d48ef4c221968
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16727 25212 bytes
font_00_sfnt_off00014dc9.bin
871377f3649b259321ed53fb5066037c28b101a7e4e323b964f867842c908201
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC9 10996 bytes
font_02_sfnt_off00019572.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19572 16792 bytes
font_03_sfnt_off0001ad84.bin
562c805f69a4e0fe441f62bfa585cb10e97186baa0c4a49f8e94d6023b2ce99d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD84 18164 bytes