Malicious PDF — malware analysis report

Static analysis result for SHA-256 a604d36bfe41003b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 02:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cbe8bc1193ecbb187a363893c4620dc5 SHA-1: 97925642d50658acba2418d3519436cf0fb55d89 SHA-256: a604d36bfe41003b1ed3483c77e6d17f70472f0f94e8caa50e5b944885dad490
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=android+dual+space PDF link annotation
    • https://ganganagardentist.com/userfiles/file/pijodikibuwimus.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/judakotukus.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/bojabovedo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e71f8b9adf---19261815711.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ff6d92a1566f3417b8b181af4614a1f3/72513752687.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/givubozar.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/42313081712.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/xijod.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/76112886471.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133b622a3d3e---vananinimo.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/jimizogorobukifuraleletiz.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/31409701748.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/56910961326.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161364ae97532f---kibakilasasumozazaj.pdfIn PDF document text
    • http://medi-sen.com/files/files/32460171363.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/bijifibeduviluzez.pdfIn PDF document text
    • https://polaria.cz/images/file/4590722442.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210911095322.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/misanonapejize.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/foxomokaxavu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FD 15928 bytes
SHA-256: 5d0c9bb598fb4bd76e420a6af6b7764069ce56cf5d6bd67a7e5945d482529afa
font_01_sfnt_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 18848 bytes
SHA-256: 619fc338f42d9b419ce7879cba8305e435c49d7b25d6e5a8221de12d021e4c5f
font_03_sfnt_off00012027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 10488 bytes
SHA-256: 29c43482dc49b5b46f2f839d3be473e13a87562bcf939e6084d19e15eecf1cd8