Malicious PDF — malware analysis report

Static analysis result for SHA-256 3514f3b2d3c22dc0…

MALICIOUS

PDF

93.7 KB Created: 2021-06-28 11:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7198580cd8368fc6d384e00377eb0d19 SHA-1: ef8c1233f06161514c6d55cf42036c832c3e598f SHA-256: 3514f3b2d3c22dc0950f31c415b0d9287c71186a38b5233afc61807fd179f27b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable domains or compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://driver-jazda.pl/upload/file/kasosoxebavorujiduketem.pdf In PDF document text
    • https://digireg.cz/upload/fulavi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7534325281e004c6835a692d81bbf8ba/53914395122.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/44592481608.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021621015277422.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/93906847368.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dfe14bf5c---senixovigudir.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/adb03516ad8d6a1e093b55a4f9b4e948/60410486795.pdfIn PDF document text
    • http://poorclarescork.ie/images/14973936091.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/32872218919.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/9feeeade5a0a9d6700acac31fcc29ecb/sokupamoman.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078e43963536---dibizuzepa.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/gixukexonawiwenolagefako.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/p0ef5f3ts2btd1rtoolba38g20/geluvotipukigi.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/55690701721.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/92017165034.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8bl1823r7qkosoan48qv63j4ke/68559150501.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/34ml0m6dqmhm1jtlq8c3r9ebdm/xekiwixavuvisu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a440f583b85---xesenuda.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/usmukaempfi3di030ol07mcu50/mewavapolixumanigewaz.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd30b666e---27059856342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=chord+back+to+december+taylor+swiftPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/77619847929.pdfIn PDF document text
    • 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_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 18960 bytes
SHA-256: 5e72a47645c068679c2fefb0e63bf29fa2946af171e1b8a109f353f8ad7c018d
font_01_sfnt_off00013581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13581 11100 bytes
SHA-256: a4f8d1fafd931de507b2831d1a7e0904173e85f66d570c1dae3a10ef4179dac1
font_02_sfnt_off00014f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1