Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c14f49b31a3115…

MALICIOUS

PDF

90.1 KB Created: 2021-08-07 01:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25fd0b0d44a7f0d2f9fd5dd90becec8d SHA-1: 1fde5d449f959ae8410862fad03c39a74eb9ea9f SHA-256: c6c14f49b31a3115b223fdeaa94952c7b9b299b181a2fc5933776b30d96f3312
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirm the attack pattern.

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 http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dee957f09cc---penunajirefipiruxoxitus.pdf In PDF document text
    • https://rivnerun.club/images/files/wegixilejuri.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160761695dc56d---53349817888.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/rajutimi.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/85412588866.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/48140542139.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/86724147278.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1s7oiqk24l9pad5kcc44jlq8sj/30978128313.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a287963a---kepukopanowudirubug.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/similu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/38792142156.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e44d99cb794948bae51a44fbeb3676fe/nejusexafepu.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/rosekapapelojujafutuloje.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/1e182ro51fq107gi59j40i1m3i/zuzomamugubagu.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/95738662239.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/12292622827.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/bab254b01c583b150d4bf17be4d367db/29412416918.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9ek92l24d283s737rp1rtallhu/febegosu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/42a14e9aaafb3c066ea9f86cc70a05d6/zinobilokutasodavozovegev.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1d1c1174f---24169547087.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/muvipapivedirajowuked.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7544b5fc3---51839409246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+spook+who+sat+next+to+the+doorPDF 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_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 17896 bytes
SHA-256: 9f7ac65e72127890d01f549c1954e2bf9315fd3adfc74b11d56fb145bae574b2
font_01_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 10596 bytes
SHA-256: 713d39860c472b8ac85868dd95cba48a6d69950e37bd4eb8ecd265ac4a4a494b
font_02_sfnt_off00014341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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