Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b7668e0e5c84ba…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 22:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edbf5517d4ff7dc00f98cb999fc04844 SHA-1: fd136fd37dde7c24e39be7f6812c1a752a93febd SHA-256: c5b7668e0e5c84ba905674df1d518e216955b2e8e49d58f4e585ce6c4483ad64
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. The file functions as a link farm, containing numerous URLs pointing to compromised websites, which is a common tactic for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics strongly suggests this PDF is designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/uplcv?utm_term=dark+souls+3+poise+calculator PDF link annotation
    • http://vasset.bg/userfiles/file/danivujunozemegujuganefi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fejeluzijanusaxanatil.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb68363f7---pibaw.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161482e597d196---50774367538.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/7589618810.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/27015178380.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/83d9548b9f4f7f946cebb79e0e79d2ef/9525438449.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ed3eaaa06---gotevaxuremixep.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/gigipid.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/kouer1ma09kc1sp61e5r41e1sp/rikebataxizik.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/46904207017.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/gugelaruzavurabekufola.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/99847756408.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/97294949333.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/50736209893.pdfIn PDF document text
    • https://baglab.pl/galeria/file/pemodaridig.pdfIn PDF document text
    • http://373113.linker.tw/files/nupuguwenobaxim.pdfIn PDF document text
    • https://stotex.rs/files/55616720426.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/97539867536.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_off0000ad91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A3 16780 bytes
SHA-256: 1c3129576ab57f40ece5522323558a64ba7fae5ade2501c8dba7ee1b3ba4711b
font_02_sfnt_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 10628 bytes
SHA-256: aa4c1fd7fb107b108e96c66f7f40ed582edbeaab86b11be30e671cb38ae41067