Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80cdb55f309b763…

MALICIOUS

PDF

90.0 KB Created: 2021-09-02 17:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 711d2039d0ca047d4ce36811785873c4 SHA-1: 7195fd04556f07e2265b4bd96cd28cd296ba3268 SHA-256: b80cdb55f309b763210e803294f262f7c6fad739e1dbecce1e2b4fcf814a0d09
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa9821f506---20127606619.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834d289c853---85400680600.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a37201d4859---sizevexojoxifajosij.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/piwujetoxaz.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//87293154852.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/47353fe312835d72534dd670f12f39ba/zutelozurokug.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a370d707---94621476003.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/lezovizifi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tupejilaxavemor.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/k7flk7f9etjgcujiamdnkjkmt3/dukex.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b90437783f5---7562883832.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/rizitifanagidimawozorewus.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb28ed0c8c---bapuk.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nitovinikilukupab.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab72c81a8---digagedizovin.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/68208138133.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/nh0m0nvtr17uff1f4df21mnnmh/neturipu.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/59287828800.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/740dc169a5a3b5ee081fc315d630b4f9/damedenenono.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/13025832021.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9cc1bbeb3b15076b05e76f20883f24e4/loretuwiru.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160985ca10d697---36726945036.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a816bd57054---munukapofevagiremesipap.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e877c810dc8---59801788157.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c8f30e1aef2---vifivesowiloxumixu.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/20242673036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=idioms+pdf+for+ssc+cglPDF 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_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 17248 bytes
SHA-256: ee6012941195416c5a50b1812076ace8dae1c4b8171d323d37b7d8af30577b44
font_01_sfnt_off00012b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14342 10420 bytes
SHA-256: 3fa99f2ddd5747cd1a6634e63f7d90ad7a466a5f1168d03c95c7bf985a83fcde