Malicious PDF — malware analysis report

Static analysis result for SHA-256 09361f667b246630…

MALICIOUS

PDF

76.5 KB Created: 2021-06-30 14:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f928c39b8e6ee85a226224a7e4835fb0 SHA-1: 978f7e64dc0e5842515886b16c4ad999924f9075 SHA-256: 09361f667b246630d37e300ab40d062676f698d6327b7b23eac0c7e338cbb098
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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The primary attack pattern involves luring users to potentially malicious content through a series of redirects originating from the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5d3802f43f4b653a90e3461e87d30192/5589762102.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609f274e9ba2c---65662592982.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f98004408e---80007204083.pdf
    • https://securityguardsupply.com/php/uploads/file/90419171254.pdf
    • https://bawwabatrizq.com/userfiles/file/popekuxisosiwi.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ecff7d9c2c84a8b5b525fc9b73f78a90/wewefotifakapume.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/qn9hmi64cs6en2t9a4q03a4rg5/wazudow.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f5c36835c---sinerade.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/l9a2dkqfuab8jobjjm2j3orqnr/63083183921.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/33faa0ddf99945e5e4252f9267099bc0/wobozug.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3q8pec6vnk4sqad1avh8k997m4/27312995364.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094af3c179ad---43966157742.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4084b7c9b---84827612204.pdf
    • https://onlinendttraining.net/files/20555191370.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/gemetosotifamij.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1994cb151---dugezudojiwebavad.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096ebd5d16ea---gewufipepotewuxi.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095ef9496a0b---lowogujupaper.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac76bb619e---xikunotomowe.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/honk4jk3mfluhsh2iqe72d1be6/53723857716.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dvncpnm32j64lue76ug2p3uv34/77936084356.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd4e9e3f30---79376911627.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/dde4f58d7277c2ae2125a455240c8a83/49452960178.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088dece5d12a---76133606042.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4b06c437d---1059385237.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=apple+cranberry+crumble
    • 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_off0000cb63.bin
081af68c9f42b688150c2fca6a5956cf5a037e9316df0951d5b495112f355412
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB63 10392 bytes
font_01_sfnt_off0000e2af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 16792 bytes
font_02_sfnt_off0000fac1.bin
9e33cbf47d1e06a85e2fac1ed5f5d94f4967d0d2ec2d1eb5cabcaa225efed252
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 16312 bytes