Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3f7c42ec60db9e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-30 15:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90f0065577b644acd1e4ba24b654347f SHA-1: f797cea138a9b46e08b340c0a149f954df9281de SHA-256: ad3f7c42ec60db9ec96348d72ca10615d0dc3c52ffeac1bdb8b8f47d37db1847
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The use of compromised CMS upload storage is a common tactic for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://abwingssuffolk2.com/uploads/files/pukizetaruvugagiwuso.pdf
    • http://vinhthuan.com/upload/files/99355602145.pdf
    • http://dpsnowodworze.pl/userfiles/file/90256344739.pdf
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/gisofija.pdf
    • http://electric-kernbichler.at/fulepojaxi.pdf
    • http://benrassam.com/uploads/files/2313344245.pdf
    • https://atpl.aero/ckfinder/userfiles/files/gepojukuxelo.pdf
    • https://vayamcs.com/content_files/files/xogudigitadoxelozudenov.pdf
    • http://wonderpanel.com/app/webroot/img/file/58302555533.pdf
    • https://websbag.com/uploads/files/fawotagapoxuzodosedir.pdf
    • http://wmasgroup.com/userfiles/file/50793226548.pdf
    • https://ibeguiristain.com/userfiles/files/mabexonaviloner.pdf
    • http://cx-gl.hu/images/files/bavotimezaxafo.pdf
    • http://tcgardening.com/userfiles/file/2021090400265073499.pdf
    • http://partnercable.com/files/demonumadaniguwipo.pdf
    • http://arcstema.com/userfiles/files/toxelitimaketufodadiji.pdf
    • http://marcth.pl/media/fck/file/kibew.pdf
    • https://www.vconsole.com/ckfinder/files/42546451986.pdf
    • http://numismatika-nbkpdy.cz/userfiles/file/7927143021.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16149afe3b03ab---14069489038.pdf
    • https://menu2uplus.com/images/file/jabob.pdf
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/32170838281.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91354ffb7---58467214758.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142292fceae3---dosarelob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=javascript+%26+jquery+the+missing+manual+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_off0000c1b3.bin
9058b358f57c2e70f0a50bbe6e2a1d849f53be79fbff8f6acf03047c8df8b9a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B3 10016 bytes
font_01_sfnt_off0000d807.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 16792 bytes
font_02_sfnt_off0000f019.bin
d55f105ecced5e29dd5577c5a60dbea61f24248492ab8564e14c2b0375d76e53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 18388 bytes

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