Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd04c8e7a5ab2f04…

MALICIOUS

PDF

90.9 KB Created: 2021-09-20 02:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55cfce016a772b07659ae532eb071795 SHA-1: e7ac79469748a67f25a0a73c8040cdbf95bf284e SHA-256: cd04c8e7a5ab2f045f4ae4f4426f7af929c4fc1accb827d444452c8bfe5f8a40
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=dragon+ball+super+english+dub+torrent
    • http://pronobile.com/catalog/file/57734881290.pdf
    • http://adhdesign.de/userContent/files/20210906081419-kevirabojijosutip.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/88706636446.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/43315144835.pdf
    • http://seteo-dechets.com/images/file/98268188759.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/48201025407.pdf
    • https://moyaexpresss.com/ckfinder/userfiles/files/7781589665.pdf
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/kigunexorukude.pdf
    • https://nstyapi.com/resimler/files/68676020546.pdf
    • https://revive.fashion/upload/files/zobitadafezituganidoka.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/54389gd06hhjtodcct41ln6hq2/81382159942.pdf
    • http://robalton.es/Albums/images/file///48082324234.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb29e0239---famaxalaboni.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/vasikiledarajegitujomam.pdf
    • http://fd-health.com/upload/ckeditor/files/garidapupojenipe.pdf
    • http://shippingengineering.com/files/ckeditorothers/nejogegasavufi.pdf
    • http://joyear.com/ckfinder/userfiles/files/88031521361.pdf
    • http://lovesenergy.com/file/luxulazurakalofitimeda.pdf
    • http://panziofabian.hu/fck_kepek/duraf.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/91847219.pdf
    • https://biocoils.com/img/file/waxepixekoviduvododepux.pdf
    • http://divapharma.com/uploaded/file/ruzufuzagifuluvafuk.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4b45f107ea1af55750787f351bbd12ab/matigakusekamiwuj.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/64221146593.pdf
    • http://4els.ru/uploads/images/files/jajusukivulofopeguxibef.pdf
    • http://leoclubmarsala.it/userfiles/files/jelugogimigemora.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f0d250f6---jixaza.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d507659e6e---28104834776.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_off0000f8e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 16792 bytes
font_01_sfnt_off000110f9.bin
51e8e5a8430d22185a35c98af6080e09ba1ed52955d240d6434acdcce958e95a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 20108 bytes
font_02_sfnt_off00014564.bin
8b169d2ab263dfbf3bae5ce4d8d78c8cdf629447ffc5129a8328266c475efb18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14564 10912 bytes

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