Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac11466e6975eeaf…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 10:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5ed8b673b4185589311a8a6367819e0 SHA-1: 4fc1c0d3e0af5d9a7b9c6340b16f37537d579178 SHA-256: ac11466e6975eeafbfb3f5f51844db3299135374c575203084cdc0674a434944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://study-abroad-travel.com/ckfinder/userfiles/file/68713754191.pdf
    • http://terezmisszio.eu/files/file/besamunok.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/11310afc8ee43dc06282fad6a2593669/32305927983.pdf
    • http://randalljroutson.com/clients/44711/File/82830862252.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/60335447017.pdf
    • https://gulf-rope.com/images/bulk_images/files/fatonabaraluwijazuruxuzer.pdf
    • http://digivideos.net/ckfinder/userfiles/files/jufulokatagopirijab.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/vuf8pibm3icn1arhfe1hfguu36/87485367742.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1015490df---dedanabojemugamewokuxatex.pdf
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/kukeges.pdf
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/rapavafesujasezudane.pdf
    • http://pattarasawat.com/ckfinder/userfiles/files/48886492532.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/dvlplk6ps1opcg1lpuiv7p4kd6/lanuxesenizalew.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/73338398064.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5675b14bc621e2d73251baf066c316c3/fubunidovawuporad.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/78809204809.pdf
    • https://aduanaldelvalle.com/userfiles/file/fesomanebanizez.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b875bea2954---ruzenewap.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe150c5617---82090554661.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88545f2463---20716649408.pdf
    • https://grafconsulting.pl/Upload/file/powilakabarabomunumexatas.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/612d7f9d22bd8e92fd9c60685aca4757/41552232034.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tendido+de+cama+tipos+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e427.bin
4d45c38dcf22259f68c8fd74c149e91d8ff0c8f73cc614102241980760ebccf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 18392 bytes
font_01_sfnt_off00011235.bin
d1f64c85dbcdbdb5e290824d02a09636a291cf71aaa4afc6fbf45d1e1e520d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 10596 bytes
font_02_sfnt_off00012a69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 16792 bytes