Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6037e04efda258…

MALICIOUS

PDF

107.1 KB Created: 2021-06-26 05:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 130884d6052b09807d397611dd0e9bfa SHA-1: 5ebb1385097e1cadf84e54415d64e3a64bdfaff4 SHA-256: 5f6037e04efda25871855ababb08c5e086647a576cfe483e2f10b833b83fd012
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such links, often associated with phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://eventspicer.com/ckfinder/userfiles/files/45190887497.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/97520053196.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/esess00blgn6it357u0v7fnr9d/jowefoxefifimetomor.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094af8ca9c85---46590094686.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3lq3l246el5hk7kmulcctt7f68/nadukufigewifemiw.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/sekogagefarizoz.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/42e5e2f079d9e1b96dae53b002b9445b/12634355935.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f175abed---lavilulamitigudanojaw.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cacc464280e921e5be068710ba9c6498/89244530196.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/3eb1ff8eda893e53a22a8d38834a67c2/lesun.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc897364e7---65993464112.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a64cd0e1---kezogigupowipadiru.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/fe2d8894510e75855dec951246c8c665/fofarunitunevitakesa.pdf
    • http://beastyenergy.com/userfiles/file/mubewajuxowozinonojo.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/47a50f2b5bfdc55bbf3410263049851a/telinaxitazofo.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/ac981894a2540c8f139e9dea4e325bb6/jomevikajasada.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d2875ca12---xekakuzukejikabix.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d2ae2c5968a74542bd0340d73fa90922/xelakuw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c875f92942c---61694387989.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/31ii20i7tl777gc6ja1u5hf9ql/xuninopasubokemow.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/auribiv5d8adqge2sa9jkc8qrr/10028775452.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2867021c---77460012391.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+characteristic+impedance+of+a+waveguide
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ead.bin
34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 16168 bytes
font_01_sfnt_off00013445.bin
e5a93fc2d845988e3739db81f926f93bc9be65a742af14bd079f9a4a7a58b988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13445 11236 bytes
font_02_sfnt_off00014e54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E54 16792 bytes
font_03_sfnt_off00016666.bin
d3063fd2d8e2bc93728113ecced01c1f293ba3c1bdaf891c7420818967fa501a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16666 21156 bytes

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