Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef690d5645e54385…

MALICIOUS

PDF

85.4 KB Created: 2021-07-04 02:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c7b0e49c02f8aeebcdbb1565c7422c4 SHA-1: 967aacc600c447d9d36f25ca7394a649c6177dbd SHA-256: ef690d5645e54385452eef93d8dd884db4bf6bf946fef7e1c8ec7e433f1173b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=picture+of+internal+body+parts
    • http://av-jet.ru/userfiles/file/zoxipetugojebenovuw.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/rvh2n3da6uccdq4i7ke82sdi0i/laderigopakileda.pdf
    • https://africanresearchcenter.com/userfiles/file/depumesodidorexa.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bca7e328513---13451572071.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a376f7ed96a---javugubejemiwijoraborap.pdf
    • http://rayanchem.com/d/files/gotutifupew.pdf
    • http://ricarda-allegra.de/userfiles/file/72029124145.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2236bd26---78853796926.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/cgn9b9u4brn15isnpppe3v2a9j/86173262163.pdf
    • https://langumeistras.lt/i/File/xoxibufilawu.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/gisefawuwilapad.pdf
    • https://samudra99.com/contents//files/kelijodagar.pdf
    • https://landbar.com/upload/files/51341793200.pdf
    • http://contactconfiance.com/files/files/59311938131.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160765bf202063---polasumiravebumolugama.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ab4df7f6---nogufomudipaxaxeg.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9723e19511---jitun.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/1270082322.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1314f177c51bb837f38aa3e2bc41fb19/55474353564.pdf
    • https://studiopros.com/userfiles/file/
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa92352fcbf---vaxizexasipanorixixiv.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_off0000ed4d.bin
3db76db27c17caecd978d6ef871c804c5f1ca4938fec3c33fcd7c0d47b30da00
pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 16204 bytes
font_01_sfnt_off00011730.bin
7163bf0789724e95eb6a9582403a13e9d1c62b023639b387aafd45b54905c9a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 10968 bytes
font_02_sfnt_off00013099.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 16792 bytes