Malicious PDF — malware analysis report

Static analysis result for SHA-256 334f0133ab9ae500…

MALICIOUS

PDF

90.3 KB Created: 2021-08-10 12:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79ad2a93e8139398a9f7b07d65d4b572 SHA-1: eac04e6d2b9c32e6248d4d645ea7857cc821d8b9 SHA-256: 334f0133ab9ae50069e4fc62ce8dab2ddb61f4dda24ba6bc0392a59325618e3e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

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://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/4ded23c78825e07939db199822aacd8a/34310835145.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608985d34ea42---75636823591.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fb077d7c0---6222866597.pdf
    • http://arredamentoambienti.it/img/file/7989890069.pdf
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/15579461329.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0735bf7b0---mawowizulosavija.pdf
    • https://asiarsolutions.com/userfiles/file/juwubuterewoguxizote.pdf
    • http://vinhthuan.vn/upload/files/xagaroj.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16079270f762ea---39187860227.pdf
    • http://clingac.com/d/files/94097827150.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/901d125aed5ffa3b6ddd9f17543e0585/34840137971.pdf
    • http://cerrutistudio.eu/userfiles/files/88294171233.pdf
    • http://www.cafeinca.com/img/public/contenido/file/7351557044.pdf
    • http://doktor-okonski.pl/uploadimg/file/tatenaxisa.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160915951b8198---61348184470.pdf
    • https://dcoderesearch.com/uploads/30869940668.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb46909776---rapagabezojubowug.pdf
    • http://glenbardwest1965.com/clients/0/00/000b938fadf99fc3242526d4297efebf/File/84153925774.pdf
    • http://tavio.su/files/file/belokawazarupigajareg.pdf
    • http://harmonie-avion.fr/actualite/files/63736858372.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b8b9bc3dd---9043354748.pdf
    • http://agarimo.com/archivos/archivos/zuwofejidiruki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=definici%C3%B3n+de+literatura+seg%C3%BAn+autores+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_off0000f849.bin
921be5827f80bfaf523f3a90b85bef862d1e3d58210892f16fc4705061cbc2b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 11152 bytes
font_01_sfnt_off000111c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 16792 bytes
font_02_sfnt_off000129d7.bin
a135a15480767e6b8f5eb7ca41e54dc9bc62a377f2a473192ff7d326796729a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D7 18420 bytes