Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f05e9b0bd6dc28f…

MALICIOUS

PDF

92.5 KB Created: 2021-08-03 10:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fabf73cde6d7893a0340f4ef9c3609f SHA-1: 5866e0ee6695f4f303062485b9cfb339b8f16832 SHA-256: 2f05e9b0bd6dc28fe355f36060d12b28ff14be8df2fa2c7c194b1ecb480e01e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The primary function appears to be acting as a link farm to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b2c870970c74aacfcb8f5b0fd9e18461/wosibatozuzavilige.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9889c761f---98381560063.pdf
    • http://lamachine.nl/userfiles/file/15507375164.pdf
    • http://boldogelet.hu/media/16316117563.pdf
    • https://meesens.be/KrMee/Tekstverwerker/rekugunodanuxa.pdf
    • https://avenue102.com/uploads/file/72744193247.pdf
    • http://mega.kz/media/upload/files/kaxumipuwedipexoselivedeg.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xapetejiguxawogul.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102f3b3bc72a---dukeromivibuxugagavonefud.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfc17ee22---zarijogidagogaj.pdf
    • http://capital96.com/userfiles/file/76044788904.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72e61955e---72000137339.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758e2671468---17980329818.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/f2ba4df6f4e4122130c6e161b4164620/makilixefezosebupif.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1424b9705bb01ac9c2aa95fb5c9b0310/suxojepubunel.pdf
    • http://kasargod.net/uploads/file/buzejovogeber.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sazasalesibanurosuruwi.pdf
    • https://ngusacdon.com/upload/files/sesajegorefaxijulasosi.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a48e5ccff22---77849314481.pdf
    • http://wasserburg.pl/userfiles/file/55010199071.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe1b57cf93---lumudugijalekimesimu.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab589fc9090---37917378731.pdf
    • http://buergerforum-tirol.at/file/72676415387.pdf
    • https://hzautomatisering.nl/userfiles/file/webutarizupoma.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609841c1d6f24---35033920721.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=neverwinter+potion+of+greater+healing
    • 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_off00010617.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 16792 bytes
font_01_sfnt_off00011e2e.bin
5d5f420cbb9c91ab5d336febbd2ec91bd0d7034f28534de89902741e3de32171
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 10596 bytes
font_02_sfnt_off00013658.bin
a46da8140e66d2918ad8d01c0c9903ead2e3b3a0ba348559851732152770ef5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13658 17256 bytes