Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91c1081725204df…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 08:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae0153f35cb254ac5a6acd615f4750d6 SHA-1: f5fa107b09e4caad1cb40bc6d31ef8f824009f91 SHA-256: b91c1081725204dfea06f423cfeaf80c05a48febcdf9f906539e9daccd49a9c3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1e257d527---45595642411.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877ff4c7a89---zagesu.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc67724403---92874673297.pdfIn PDF document text
    • http://canadanur.com/resimler/files/wimerekukerupa.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pg71e0n5lq277ku8pl95qefqo0/44185455081.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1efb58826---pubuwuradevixogar.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/8jgf73apr462bt97cmqlvgsjno/67482728804.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/78026627019.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/4491158827.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/33164171447.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a6a66ab5---21214142659.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/ribifovemexulogadasu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3skesdil8shh1k3l67rftr9a9s/77838197482.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4ecc1d48d640d2e26ff7f15c0cad114b/91012306657.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/lavibezerek.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094342634b7d---29033279739.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9e33a7901dd140db034a969a704b7c38/poluvenifi.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/doromobisesesu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2fe0b57d3c2ee99cb575ef50e44780b9/19187549571.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161277ea0aedbf---zudatib.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/58599752457.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/lifizuvoxofeludigeber.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/ruwezan.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/besuj.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/1hncmt7kct0mkrrlicj63vcajr/64322657861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+hyperinflation+technique+videoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE7 14800 bytes
SHA-256: 2eadbef082d8f9ca370554ae59bb26db6cd1c610527c98721973a5b3de8b3482
font_01_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10968 bytes
SHA-256: 6c126d701502d4e0e378ac409daa8b7d283b04c0b411998b0bde13f5b5cecdec
font_03_sfnt_off000113b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 2132 bytes
SHA-256: 8ad1629d78958631526aea0a74d0b163a5252944052d54f78beed5240939c1a1

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