Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb29a94f943a963c…

MALICIOUS

PDF

90.1 KB Created: 2021-06-28 14:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bab79dd8ef8ab000d40fed7e73b8c2b8 SHA-1: e403aa6945a88a25c02ba0a8f5cead9a43c01fe8 SHA-256: cb29a94f943a963c1102d577f04f43d24494fb5832d8a15201fd9a451c4f45e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The primary attack pattern involves exploiting user trust through a seemingly innocuous PDF to redirect them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5927ab73---35456124729.pdf In PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/zewaguduvagitukimudizat.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24d8dd4fa---ratuxuxeborinegikixi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/34126677522.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5664e50efc280f2517a332f126286b81/ratumu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/korebiwemawusumunojow.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085322a12f88---91387090850.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/71361830255.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdok5ndohje3rq6levvth2q058/nazufixesanugakog.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a05636d2ae2---25269390528.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc8d65d734---xawizixi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081e56be7c55---gakutun.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/74296704809.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/setosadokesavujuwup.pdfIn PDF document text
    • http://prosquash.by/data/9749716214.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/dafff0d00dd45f3a29a34192c5dfc586/nojifis.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e605d06845---kefemuxalulo.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/k9nj67e6ukqu82t2ln0ssvj54s/rixelorufiwi.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/k5ikoohsj6be6ag2u2pc8ecbrs/79141388661.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/51535263809.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k08sje18of4j0s4i4tf6j6771q/22375230325.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/bcf4a55f1f3cd53c3eac041dead346d6/43438336071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+articles+for+kidsPDF 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_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10456 bytes
SHA-256: 1dc302399fc65646a0c25807092261c028d565a5fa43b284eb56c3b7a97f6017
font_01_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 17172 bytes
SHA-256: 208e33670a9a6d546840e1401798a2c3e711cbcad68e212dee05c502dfbd802f

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