Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a24c27b1c01a72a…

MALICIOUS

PDF

90.0 KB Created: 2021-07-05 16:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81c795101a76c8d6f710d2f089e200c8 SHA-1: 84260b2dc81c02d5d09c3b9c27cf1a2f74988c96 SHA-256: 8a24c27b1c01a72a8b44f2a3283ce1b464a21dca491a1dbf8004f8083f976c12
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it's designed to lure users to external sites through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=best+cheap+manual+cars+under+5k
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/83641045069.pdf
    • https://4appsoftware.it/file/35754952024.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babb137a909---47912939145.pdf
    • https://teyadegitimvideo.com/calisma2/files/uploads/12748957776.pdf
    • https://mytopics.it/uploads/file/weroxijovuwirizuzanaf.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/2069323932.pdf
    • http://lab4050.com/upload/editor/file/20504571622.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-6-25/20210625173151140797.pdf
    • http://www.gonouvellezelande.com/files/latubuvalizumud.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/95oas2ci5fhjs12e1g6k6sqm81/pinazalijutajofasode.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7487daf016---8237048772.pdf
    • https://noddy.nu/images/file/29580825487.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c3107e8529b---kumonisevuwowelin.pdf
    • https://argumentua.com/i/file/55273990187.pdf
    • http://yule-sign.com/upload/editor/file/20210624202749.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/q1uufgm5dn3qeoq8dj867phv4p/mixoxetameduwuzus.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa248677aa4---liluriroxivedo.pdf
    • http://ndt-tl.ru/upload/file/23465584941.pdf
    • https://bmw-zona.ru/uploads/file/vakara.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf337e3ba7---47340308878.pdf
    • http://fsgpj.com/upfolder/e/files/20210619181505.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/c0a59da437bb9019e4f9e9fa94a51b09/bulaxunojiminubujadum.pdf
    • http://fatamorgana.fr/uploads/assets/file/dovodekijobegosi.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/13c9a6893a43bdfd881818947c2dba46/77323653798.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/35e0nib4notgnv6angdsa7pog0/davakem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad4.bin
2bf9747fe8255711a32cde8826fa8eebad88f1ed0682644394b7d787f664859d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 17292 bytes
font_01_sfnt_off000127db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16792 bytes
font_02_sfnt_off00013ff2.bin
093cb07a6e72d9a69d7945f0cc1281c95e6f3e0f2637159b2ca7f9cbffc83534
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF2 10948 bytes