Malicious PDF — malware analysis report

Static analysis result for SHA-256 50be67328a2f4f8b…

MALICIOUS

PDF

84.2 KB Created: 2021-07-12 16:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 173c69a9850ef6ed8f3d3a14c5923ac5 SHA-1: 698e21837a2cb9717c72b6961dc28be1616b5bca SHA-256: 50be67328a2f4f8b330598106d869ffb02226bff2bc8022544b9b93b9cad3402
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces the nature of the file as a deceptive link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c43a3f846---jesaw.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be97c5e93e3---gevokejezebunon.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b54b7c497a2---20684530904.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/nabibagezirazu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/tulasut.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/9061635908.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/malegodo.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66f58c083---zebesubogafalikimagibut.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/94487986728.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/kirukazigorot.pdfIn PDF document text
    • https://langumeistras.lt/i/File/luliwepiruxuw.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16077aeca0f3a9---wevajugoloxedaroligebijak.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/xuzatamajoga.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/55912897303.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/jusezididu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2h1msvidm2jo0l3to2mv6e6s26/rilibap.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p5gklpit87etl3da4a35p93vuc/15669838338.pdfIn PDF document text
    • http://rurisnet.org/images/file/bagimerazaginitupegabole.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/nomepazemaduwibubupog.pdfIn PDF document text
    • https://yuss.it/file/nuzosej.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/xivosexu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bc4ac9056---24705842655.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fmtr3p8rp7agldldji5ilj86v8/jekegapane.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qlhar50qj4vgrnbgs7lg7o1k2l/kukibediwip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=high+sweating+on+facePDF 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_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 10544 bytes
SHA-256: c2a7c8e7518b13c3997f2c2e96921ee7528d685fa0312967b270a05b8a41b814
font_01_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 16476 bytes
SHA-256: 6056f22f8d555982a0e3adf42433ff6726917c2e5a87478dc9bca6840680e512
font_02_sfnt_off00012bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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