Malicious PDF — malware analysis report

Static analysis result for SHA-256 873af06807fe5520…

MALICIOUS

PDF

80.6 KB Created: 2021-07-03 13:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 12855e6c7b4aeb793f1f252e83b6b77e SHA-1: f6cc072d6a77698d72040c0033bdae20e440f7b7 SHA-256: 873af06807fe5520024e10903098ca5760e4c43fd12ed845980325096b0e818e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm hosted on compromised WordPress sites, directing users to potentially malicious PDF files. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9eee6cc381---zenipifa.pdf In PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/nefilizetevi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982fb791a91---sedexajubamamaxopasogijiw.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/34532349684.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f045070af---vesixopu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/94d663fe7c17c54fd49c1189a83fb22f/23613290338.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510175624355829.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210614_06F6BA6D0F6DE68A.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/15855107160.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16203448776953.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070c1a2b6d15---rorerezosalofavamiro.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/66ceec0bffd186622604c8ecff189570/34035645233.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ff4244a---75976748102.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b36c8df18---96270671264.pdfIn PDF document text
    • https://rcot.org/userfiles/file/8499776862.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/zedizelawes.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0eb9802b---23016552644.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/tamiranag.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/29c0a1762acfc0409580534ed14843b1/wurujefo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0c8b32d15647004acbbe12e2132ae27a/gutowogulinoxodizizadim.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/31614899929.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/80580374396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=south+park+phone+destroyer+generatorPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 17488 bytes
SHA-256: ba1fc011fa6e0297773d0d1a38271fb6bf5f2dc9190fbc0b3c756a427e1e267f
font_02_sfnt_off00011c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 10912 bytes
SHA-256: 4789dc5aee0518fb9bc17c5750ed9bbdf65a64c60cf52218832e59afd98ae7cf

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