Malicious PDF — malware analysis report

Static analysis result for SHA-256 c768a91c533ce000…

MALICIOUS

PDF

75.8 KB Created: 2021-07-22 00:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f990ab201ce8d295e20722d96eda8bd2 SHA-1: 045d8bee2e0a2c67fdbb6f8d19b9b14a2cfb24f7 SHA-256: c768a91c533ce00097a9d66483d1a6dca09295b969f3b2d7f7c1f04bd0ac1564
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072629f5d3b4---58303267066.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092be171c91e---gavuvomofomatunoru.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/7488051660.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/n3vf0t2h28knc2hv3qnapia393/94607824982.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/ae08ffbce4cadbb2fd120be24c3ecbf8/15452444526.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e989c1410---73452323790.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/lizisi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee853b8588a---siwaxuduwulam.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098c63c9a6ea---23691343356.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0ff606edb7ecfe5d2162094d737d9dc7/bukigusimuwamezidevakid.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934fa8e9e38---gituluwixulapuz.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c4b7a65b---87214911567.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a8574b78d---zafigiwonanolukunovelupo.pdfIn PDF document text
    • https://artbynela.com/uploads/file/vowazalexowax.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d80f4bf94cd286f311b8b22c5a02e08b/nozezasi.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/2441614521.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20cb406bf---32477256283.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3fd6be8e8---41918285393.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/xeretajivuxekegatofuziw.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/latukonimozeta.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/xixikemozekiloba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=photosynthesis+diagrams+worksheetPDF 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_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 10944 bytes
SHA-256: 100c0a87ae9ce2f3402500920c10f99ba1282470b8f2c1e9c339e2d8f1a761f9
font_01_sfnt_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 16168 bytes
SHA-256: c32666a7d1c70eebf3e0bb4e8c7a31f5eced44eecb0fff3a33bf6c5e239b5a3d
font_02_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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