Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95679f66c452e26…

MALICIOUS

PDF

85.3 KB Created: 2021-06-30 21:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5179c07ed8ed268969cd3803bc0bb45 SHA-1: 803c3c68a0fae03b13e620b6bb1ebf9bede3f80d SHA-256: e95679f66c452e26ebc8b307931321814e9e4888d988075fe0cc965c4a0fceeb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a tactic to host malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms on disposable hosting further supports a malicious purpose, likely to distribute further malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://usaoxin.com/userfiles/2021-5/file/bomojotido.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7526ef8c---11536611306.pdf
    • http://aktifithalat.com/resimlerfiles/1443914381.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a942f78ba4d---80385451790.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca2c67d8a---97426054963.pdf
    • http://cuatro-pr.org/sites/default/files/file/50423970013.pdf
    • http://associatedreclaimed.com/userfiles/files/zitafadilegugufezuvibi.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/246a6e35ab7f0d5a0c0bda3f5b5a3bec/39758037456.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/xesexexitevuxupu.pdf
    • http://wojno-stal.pl/pliki/file/zerofanalixiwanow.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1848e49735---64497205117.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/sequt2g6ao5b8p2d5f77cc1o61/sojubijaxomujovezi.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/29685624991.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e25de9e15265976f8cc44cfb01489b2/bemitugaxekojixu.pdf
    • http://midel.me/userfiles/file/jivexatogedaw.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b25977cb7fe---lometujolemunogisarez.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d45590926f1---29290914871.pdf
    • http://analogsys.com/uploaded/file/158268766260a005e0cd164.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608391e77d242---3132567861.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6a12681bdfb3a9ae73808c71f87fa00c/38088533637.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0ddca96998c3e8807a124299560f485/tigepetufifuvijaserijede.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1ce0935b---lusivimozolire.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940136e9442---jekuraz.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a4689e6ead75de5e15e61b6a57522652/17429061220.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/16da3e0cc8d5c7d8004710e483385141/pasodav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=chemical+name+for+k3p
    • 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_off0000eb8e.bin
1a74293d7fe3be309e6c64a623e00ad8a2a358fa9afdb4a69625cd8649922bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 16924 bytes
font_01_sfnt_off00011785.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 16792 bytes
font_02_sfnt_off00012f9c.bin
bb3c664070d73331af911826c1545be0f32d7df2c972287e18b7a137aa8675e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9C 10772 bytes