Malicious PDF — malware analysis report

Static analysis result for SHA-256 89573328ea3f3235…

MALICIOUS

PDF

91.1 KB Created: 2021-09-12 05:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64008590e367944a0302eb50a1bbeeda SHA-1: d8a65c6bf8abed6d978bcb0a7f297a3e16e886a6 SHA-256: 89573328ea3f32358100c7bd35ccf5fc0d98efc42eca908bc38b29437db940c3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tractorpulling-emmeloord.nl/upload/file/depodoruf.pdf In PDF document text
    • http://jacsonsfurniture.com/userfiles/file/36815185887.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130decdbb0a7---tatomunu.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/13704077813.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/coee2jfls22e53d19aclthjj02/77514868132.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/34242842977.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/fagizizapidofivuvagis.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/58437760009.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9lsna99dv1geu387fct5ltpn27/57483860357.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/37895198364.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/12755397858.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/46408264308.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/rebajiwotawupone.pdfIn PDF document text
    • http://fohow77.ru/upload/file/48552797076.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10cdb2b05---96308330839.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/soxexinekavagoru.pdfIn PDF document text
    • http://dsraxys.com/uploads/57922111378.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/muwalumakinulawiz.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/wobaxojike.pdfIn PDF document text
    • https://istanajp2.com/contents/files/wodifokexisisududit.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/8933704571.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/15747545825.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/dijet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+processor+for+androidPDF 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_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 10620 bytes
SHA-256: 85b25949b1136fd15c0a53cfe8f982dc2d8f2558a4339f49335000bf7d0d296a
font_01_sfnt_off00011844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 18204 bytes
SHA-256: 7b3f437286283151da00f26072b18daace6f405b9406af6d3a58d7806b06a7b0
font_02_sfnt_off00014752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1