Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eab00ec927236e7…

MALICIOUS

PDF

77.8 KB Created: 2021-10-05 18:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7f27f3e609bd7f3b5004b8a4031d83f7 SHA-1: 634674cad1b90bd413532844155c306a2b00d715 SHA-256: 8eab00ec927236e758302680ae6090ffa23be942ab632a21487a3390bb49c5b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malicious content. No scripts were extracted, but the structure suggests a phishing lure designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://casaperugia.fr/userfiles/file/bawokiwiwevunipobakel.pdf In PDF document text
    • http://chizclean.ru/files/fck/file/50150874192.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/taxabanevavuzimebu.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/17894740559.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/roxojizobakawuzuradesepu.pdfIn PDF document text
    • https://greenways.at/userfiles/file/pulirizinakijud.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/xumomefureniwetorano.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109042052152737.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/lulibulogazu.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/tuxofeworotunuda.pdfIn PDF document text
    • http://e-sportis.com/images/upload/kakezazagapidag.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/39424667885.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/gipijej.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390df68af0c---fadowagevifi.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/79558415630.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/kurotedusatid.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/semaworikejo.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/79207945551.pdfIn PDF document text
    • https://kimcert.com/E/file/72434069256.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/khc2t5uji5sm284fgqv5rv3qtm/39914169606.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/64850665446.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612ea9e231ebc---xijavaxumorusudosekotede.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/54610736463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cos+127+degreesPDF 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_off0000c68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68D 10176 bytes
SHA-256: 79d15ba0620da9f05abebd70f308272355953c96a2cd79182ad3f1aa0428413d
font_01_sfnt_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 20420 bytes
SHA-256: 7bb8ed5aa6cae6d6eba5bc7725e136dfed8953aeb09f8b9db5600fb74ea21758