Malicious PDF — malware analysis report

Static analysis result for SHA-256 27496131b5dbe07b…

MALICIOUS

PDF

84.3 KB Created: 2021-08-21 00:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3dbfd5a30597d5ba0621107ffa4b5df9 SHA-1: 86ac8eda310a3b01f3f5dfe5e092ec81c4288702 SHA-256: 27496131b5dbe07b3c7eb91b98a4b3ff1e8cba2017266ad50ff4e89674c2ba09
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple links to compromised CMS upload storage and disposable hosting suggests a link farm designed to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/bo9r1fes1v861da0fedi35u942/85442229980.pdf In PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hm91162r0sb7oastvbqamjge25/59251967762.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/84774160701.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119c27a20075---80357430336.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/dikobixewat.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac4c8a928---xuxokexobima.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/16527533765.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/tamovizuj.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/jititovupapezejazubasov.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/zenerim.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9d3ddb5a---nukuzel.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/gulakudobu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/duliju.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/sepugowokevimemodib.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/577j7hfdgnkrc5ajuuetk76k05/35520192350.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/386a9d3a1743a4e71937bc9d35cd6117/nomorodap.pdfIn PDF document text
    • http://weingut-suppan.at/files/43752280418.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9f43e2c93eb8c4ba70436f66ee8af4e3/75555514222.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/74056083645.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/is39qhavk4tgh8afm15l4acf6m/relozaxafimukularu.pdfIn PDF document text
    • https://eventaipei.com/upload/files/34370489120.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/tuwujedidogarabibax.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b9ca95259---52785889662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+picsart+stickers+for+freePDF 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_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 10676 bytes
SHA-256: f7cebcc744f67c3b74fce44f31a4bf58d6c518782c9a7b183fa6c5e1ea41f6a7
font_02_sfnt_off00011350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 18084 bytes
SHA-256: 7b6d4765e4aeaf333757a1623f9cc97d26f8a5da603c259baa41194c661a460d