Malicious PDF — malware analysis report

Static analysis result for SHA-256 4651201cab763272…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 01:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61f39adbd2233e10704f6062324bbce0 SHA-1: ecbfbbf1b45c4fbe935c1d2b83c2304af8865167 SHA-256: 4651201cab76327286a02dc668899b18b50f3594075b22a9bfa9d4585c226571
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm. These links are likely used to distribute malware or host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://halongbaycruises.org/upload/files/48240129348.pdf
    • http://nwatchonline.com/userfiles/file/maxusobonakojufipadazi.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lointrol9p1brrdee174tb29j5/mogimubovokuv.pdf
    • https://snoman.mb.ca/ckfinder/userfiles/files/senerafineremofosivaxera.pdf
    • http://puginternational.com/ckfinder/userfiles/files/63513876825.pdf
    • http://moristas.com/userfiles/files/4859467118.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7ec92d6ade4cbf6790ad788f0a726abe/baluxumuni.pdf
    • https://madeirashopping.com/userfiles/file/misemox.pdf
    • http://evopizza.lt/ckfinder/userfiles/files/maniw.pdf
    • https://jewfri.kr/files/image/files/68738464909.pdf
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/dupolojuzinitisovokip.pdf
    • http://cocoon-source-harmonie.fr/public/file/66289691605.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/puxezokoguzegipa.pdf
    • http://klawiatury-foliowe.pl/_data/file/tiwuj.pdf
    • http://coinproject.com/userfiles/image/file/79255022559.pdf
    • http://dreamscar.eu/userfiles/file/tiwisixaropufores.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135f558ddef8---fezezasokexoneb.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c04b52160546363054f9b20a7d94f109/83118467955.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80a61138d---dapozafojabetagunemodo.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f40a70a3f4---96252057663.pdf
    • https://www.asoriofrio.org/ckfinder/userfiles/files/41294650441.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/dupukupan.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nice+words+that+start+with+r
    • 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_off0000e5d6.bin
ac47a02b3e3d5b2f2693de8df3a1d8eb200273572057cf1d341f68149a3d590c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 18444 bytes
font_01_sfnt_off0001148b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 16792 bytes
font_02_sfnt_off00012ca2.bin
2a023c28e61ffb0d1edb827a88df2bd9d15ccfb0dbd4beef419096b91a9c4613
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA2 10380 bytes