Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4a1bce057a75e2…

MALICIOUS

PDF

95.2 KB Created: 2021-08-25 02:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 959fd8fbb229c2210276e2d2b21ba465 SHA-1: 06a20831823136ee49787115a1e415b45bcd6009 SHA-256: 9e4a1bce057a75e2529cae22c778f6716f3bebe62be57f145b8ebac32d5f8e79
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of these links suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pixomot.ru/uplcv?utm_term=space+wolves+codex+8th+pdf PDF link annotation
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/9146585727.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/31011396426.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tasakunupizofaduv.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/60243248349.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/gulate.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/v6ekkovtl6ia4f1mcik9rkqg27/xawaripunalatasixod.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/9329d38d880488eacceb05289f916e25/tujamaforigulula.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/zefikapon.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/dojikaxoxopowegela.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/48212972950.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/43754174968.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/50999776868.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/9426830043.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ff497323b20c1acadc8e5bd85d98d738/65235530139.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/51872786648.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f01e600a---77666275575.pdfIn PDF document text
    • http://jaatkinson.com/userimages/76811376398.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/nenefawikuwosuvovinaz.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a97351f33---fapetot.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f065bf5b1e3---vokorokozemuvugonata.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56ebcbad3---wokesabasetupuxar.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/26pth97movuttnmp90fssigpjt/xawowovof.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/xemalamakomebasorurexipo.pdfIn PDF document text
    • 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_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 17348 bytes
SHA-256: 130419149b34b6140a4e9c8db9f7b8d1e5afabae66eb2ff114da7a76a74e5adf
font_01_sfnt_off00013cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDE 10960 bytes
SHA-256: daaecb5bbbbea3579b21a717a3465b2858af5552c5577272189a1627c8ae900b
font_02_sfnt_off0001568b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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