Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0ad6641200dff8…

MALICIOUS

PDF

83.9 KB Created: 2021-08-15 04:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e5a74f3b1383dd80e18e0e20f036e0c SHA-1: d6954375c1937150f282620abfc83980a26d6fc9 SHA-256: 3a0ad6641200dff827d5881f85097a8b1c6c8effcd54a54c479a626499c01c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, which identified it as a phishing trojan. The document contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm hosted on compromised or disposable infrastructure. The primary purpose seems to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=manual+instrucciones+lavadora+bluesky+blf+1009+pdf PDF link annotation
    • http://jnejendomsdrift.dk/userfiles/file/sofujijisefox.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/zekepo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/mdti49e10fdufui4e1v1j7jash/30314215961.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/rikepuwugewuzelep.pdfIn PDF document text
    • https://remini.hu/userfiles/file/niveroniza.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/ramajoloxunesen.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/23918658789.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/97576684956.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/lavuvam.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3e078609e---sixefiseweropuwekunilu.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/punud.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/b9dcf4c35a68a2e185e148ef4a74a682/99437721997.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1vi295t5svheuq5paolqds9p1o/nutigimibup.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/41016169238.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/jeb76k0o3qs9frrir404cdmvf4/dareturek.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/zavumonemagi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a0ee8313---81954000878.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a255c6e3e2---dasenifepomojiruvanav.pdfIn PDF document text
    • http://etre-belle.su/images/file/bezakazarosubopaxeligimi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610bdf5f5f4f6---navuxeva.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c50ee245cd1---96456551908.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/j8v373l8vouie4nm85jr115ft7/xunuratuwozugibonox.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/828dba23c3d0f2b72b499594ae5d8e7d/xanodanimam.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/38457159617.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845ed5b18f1---vefosirejuxenisen.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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 11460 bytes
SHA-256: a240c4f4ac344c65b99ad3fa45d946605942a755240791a072a6b9f8cfec616c
font_01_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 17924 bytes
SHA-256: 389016f77675bbc3b059476bb630e2ed5d0748bd3dc746a5495bfbe2698f8bf7
font_02_sfnt_off0001294b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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