Malicious PDF — malware analysis report

Static analysis result for SHA-256 379b9622b2ab4211…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 12:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb395dc16a0675c064c31c031d0b61d9 SHA-1: 1a0fc2ff264e4fb07e2b4129883feb7770b28219 SHA-256: 379b9622b2ab42112fabb9d5fd4a657cb014e2d396ff98e527abae0fba386023
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=best+website+to+watch+series PDF link annotation
    • https://eniedu.com/data/file/20210914022100.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/12886789845.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4d450300---bupujevul.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/pemafamalemimuk.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210920221749550689.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/ronod.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/xadevifuko.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/sigasud.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/10168192182.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/sbde3kv50uqjfs1p61gc5b9nec/petotuvopuzu.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/lukiwosuredatujugapaje.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/55125464253.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/85c6bed45d7a7755659d5b90ed17d9b2/fotoziwebikofawop.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/81511166596.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916a837880---dezubulurebubu.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/93574692818.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021910148123141.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/96578229080.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/litavu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/82285588840.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/65019875550.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3924c3d9a35747689395a48dedfb39d6/10188377949.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/86767807508.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/52757205005.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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 10456 bytes
SHA-256: 12c112577926a74f870a7457b01155427c6545c2818019184bc63677d1681df2
font_02_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 16940 bytes
SHA-256: 2e855bcdda636080c6831fa31588b49254f03adbd316d132a3f6d857dbf54425

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