Malicious PDF — malware analysis report

Static analysis result for SHA-256 391ed0a049739b98…

MALICIOUS

PDF

75.9 KB Created: 2021-09-07 05:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3dfd4f26838b02ea917cac43dfa6cac SHA-1: a0025baab70f50240cdc14c79702e2e9ccaab04e SHA-256: 391ed0a049739b981e79484c37ae7740974f214625f693ec6fe760ae6a3a4602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier output of 0.997 further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bilalyapidekorasyon.com/userfiles/file/71879749206.pdf In PDF document text
    • http://cesishotel.com/res/wysiwyg/file/ginawexesopuwexanovupu.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/82584112253.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/zinuro.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/061fd2d03c9023f96171a13e4c5a3080/kifagalarajipeguguk.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083876d87424---13104706888.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/10141431385.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/wakakavanapifijukabovav.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/48513598535.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/29721458096.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/i0uggphmas0qie8qdi1ktltl83/lovoxoku.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/51699914767.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9c534881027189aa0a5787d76e3f4ae7/vurutu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/be51aa85adc01e3a0275147b3451f52d/jeruluf.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaac8ea31b---29268554071.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0cf7709bdc050a0c4a28cb78582a1c15/lesirevesokat.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9d60563102f4d2ac7dd40cc471d0dfdd/11435244411.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/21440166673.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/5482111347.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160879e8b4b74d---73360358161.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/ziwasel.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/82799405325.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d080eaac552---29739112434.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb28a5ebc7---61441186501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=edexcel+gcse+maths+revision+guide+pdfPDF link annotation
    • 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_off0000c109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC109 11320 bytes
SHA-256: f82778955ff29222da90625aadb43e849b9a3e7de10c875ee14bd623a3b241ee
font_01_sfnt_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 17564 bytes
SHA-256: 8a728fd959b90a1f322e5c6d87bceb56f8df88d0191eed82b3fafd8cae44b058
font_02_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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