Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef038335da3394d…

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 17:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d46d7cf493fe5469c7e11ed5c5ead59 SHA-1: fc1abd16ea9565b28a2cbd6811a34c78e0ffe14e SHA-256: 5ef038335da3394d9ec9aca52f4005a03fc62125865ba71150d39e289d58a28f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of luring users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://coretry.ru/uplcv?utm_term=equation+of+a+line+questions+pdf PDF link annotation
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/3eetktg28difm6013kf2fgf3u2/farafuxolewigovokit.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac51aa32d00---2523411061.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae315e27116---53131969492.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/js875fvcgc7iaemau0fe7q9ar3/tevixesubigatupo.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/02a49c098a8c4bdecfad3936b986f5b1/xesoxojamiroxik.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e180502d2a8---76621668414.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/36efc7a8b1b330da6c98f0a24f9aba1a/56546187581.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/40b0aaa607743136b4922c7d1da9e15c/namudugaredesotafe.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/26935049990.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/nukibewidipinewalub.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e454d032a3b5c59491f662432a061ea7/24119608176.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076fdc9509b9---benerapup.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b74a9b55e3---tikukosogix.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/pimerima.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/jetenavubupodofujisav.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ms1psdkro40djg1853f3rn83od/vexezezidugefofuzi.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c161aeb26d8---jugamam.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/mafozujeti.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/399b5e283c1082f5cb8be34cff8db9a0/11344168533.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/87611199332.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/65590823795.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/vawidalutupododib.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/92106687636.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/28108839186.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/43948045731.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ujop5l50mk4f6fvp2sf9lcjjol/92669561368.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96F 16216 bytes
SHA-256: cd93dc7fe200931e70298c72710278b42dacf7b2bfc793a80dd13d02da58e0f1
font_01_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 10620 bytes
SHA-256: 549eaecf17353e5dc53ebbe6da2da1595d083bf3ec3778a17c36e74563a0acef
font_02_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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