Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bebaada4ee5768…

MALICIOUS

PDF

143.3 KB Created: 2021-06-26 18:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7a7d5b968969a0ac11db8ad268376368 SHA-1: 880137272b34d4f709a9a3f6bdcc40a4321557f0 SHA-256: 75bebaada4ee57687446ff70df960b8a4c6aac3cfc17c56cf0dfbb77b030441a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites that host further malicious content, likely for exploitation or phishing. The presence of numerous links to WordPress upload directories suggests a common technique for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a69459420---jamajonakevutuzopa.pdf In PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2665fb29f97329508f5fea7549066864/93594651512.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f6c91debaa66bcab6dc4524a6d896cdc/xasugetifedinaz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c191c19c1---65808443482.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/33d3ee377d397895b098e31ebcb8bf67/lesusilobe.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee2f88e2a0---43295124355.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/u1opfasj45f672r3dibnv0fan5/doxegaso.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e2b44cb9fbf5a478727d24d838d18cb3/xewakawunojonijarijunok.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf30ae7b269---12290638707.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/83369989157c0d5b4a6f23be32ae943c/5030040169.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/sigomimuzukikakoxalo.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/0e9870cc9f88a6a39f0f858cceee8d1b/69532815137.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050420144973499.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/gabomo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb007617dc---lesivat.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1bc4aa6e---gupurasabedowekodinawox.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae042ac0d6d---vijegeboxokolozazerivale.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/3685093257.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090be755078e---gavevisilemip.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/25454099594.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/98f877e2f2c00b63db01801bb469cf33/fewaroli.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070acea9d18b---93862167132.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc7b80a26---dediguk.pdfIn PDF document text
    • https://mollis.rs//files/56055671594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jeremy+bentham+quotes+on+utilitarianismPDF 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_off0001ca12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA12 10864 bytes
SHA-256: cc40b43d434044c8a201e9d96c060273362b1cfc2e50a98031b6abe1b405a9f0
font_01_sfnt_off0001e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2FE 20896 bytes
SHA-256: e881513ec5870b177dc893d3a899b0050de4e1131c04065ec8c4b963cf9a0f27
font_02_sfnt_off00021714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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