Malicious PDF — malware analysis report

Static analysis result for SHA-256 63de4aece51daec4…

MALICIOUS

PDF

108.4 KB Created: 2021-06-25 14:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af20faf0ffeb55049d832c15dae97caa SHA-1: 07ff16c0582917689b9bc61497115606b8a2a5ad SHA-256: 63de4aece51daec440c4e2cad2bf6579f3f83a2772a36bcb747fecfcfeec5bda
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://vattucongtrinh.com/userfiles/file/pimuwigutovajezudije.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/7mbs2802rj5a0pjtm9sq0av9hk/gonezokurepetowamelim.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bd51b44069b---1891432028.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hqa5chbd75iqkj67h4shd7p4pk/bigudamugoloxeveka.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/amgii0rr533r5n7hg5nkfa3let/menijugiladi.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/45568082873.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074abf1d32ea---xasapuzamirugabubifivo.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16079001c12ed1---vaxadazatujogenirewidusu.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160841decb2fb5---28648403918.pdf
    • http://gocep.org/data/userfiles/files/81869793409.pdf
    • https://angelsstaff.com/uploads/file/divejuvirojevupug.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f87414c154---2590553149.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/64009689096.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9e7237611b009cee602e96849b08ad1/8421603892.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4de3fd3aca27385536a6ea27f2a84018/8718182875.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=zachary+quinto+mr+spock
    • 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_off00013f7b.bin
100503d89df9de7add729d8c3687144d30b604a2acd9d980dae13c67daccbf60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7B 10876 bytes
font_01_sfnt_off00015886.bin
e87ff105e3fd5e13140d884f9288f622377acd1a995ce2d5f8b0b0cbeb4e89fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15886 20968 bytes
font_02_sfnt_off00018b8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B8D 16792 bytes

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