Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbc6331ed75e731…

MALICIOUS

PDF

89.1 KB Created: 2021-08-06 01:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 715e8257a341d8e5bfd92433b909bb81 SHA-1: f80a1b01ffab581f7b6cc876845c9304955bf652 SHA-256: 2cbc6331ed75e73193a6a281015d0c2df8d1a3569fad36641a019ad5ae64bf9f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs that point to compromised CMS upload directories, likely serving as a distribution point for phishing or malware. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ea61f86d086a4bed6aeb68697afe3771/gegibivimufegabefozen.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/eb8uq49r6k6eqj0ennkokbll15/mevofirivazuniwat.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/17251ef742472912b08948880a13c401/41608604814.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/widulitafimogaju.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/13298380675.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607560880600c---78567543568.pdfIn PDF document text
    • https://ahha.az/userfiles/file/23110027114.pdfIn PDF document text
    • http://ipublicity.cz/data/file/dubizowomobeg.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/11137807188.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/94819785408.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/25602093237.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/72700729512.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/vitukokonarulubakug.pdfIn PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/gitobozubijowosirid.pdfIn PDF document text
    • http://brlairport.com/images/file/gonovorepupip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88190ad6ec---68375502858.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/59221124204.pdfIn PDF document text
    • https://isleo.com/i_photos/file/9456945808.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/lavorojuzizox.pdfIn PDF document text
    • https://lecachet.fr/docs/files/67884310762.pdfIn PDF document text
    • http://talleresjpg.es/img/file/zepaw.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aebdc2307---kovakomuketarigosamubo.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/2b13bd82475014226afcbd53524df5ab/36177400965.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabadb55172---segonixedekovobekez.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/letubeziguluri.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/2010e0c0871733cea0d23c1175af894a/24477788455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=skin+changer+fortnite+download+macPDF 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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 24156 bytes
SHA-256: 74ad6b61ee5784e3ddc98b729d76fce6f407a0e63e632096b41e0cd3fb5fb091
font_01_sfnt_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA7 11008 bytes
SHA-256: 8068b18b0702f1b8ff257dfb380aedb902b5ff6c1c9535e52c4dd11c4596772a

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