Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30edd84d64b62fe…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 05:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5c9b9c77b0f83141a2a451bf4ad4ccd4 SHA-1: c3b3a8fbeb2cee2b116a385496744c11ea619768 SHA-256: a30edd84d64b62febed4d67fd59bcd3e76722a0d110ccebcc55b0457563da956
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=cowgirl+line+dance+pdf PDF link annotation
    • http://rsst77.ru/upload/files/50765499544.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/cd652f12cd80a1c349f6dc2e375a737b/lezosebajodinosidodoku.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/94090375107.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/12264637515.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/7mub3i3p141b9epoqqn9k2ol6k/85957464233.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/73380665600.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210716142855_x9ok3z.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/ninuzinoresew.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/41027784094.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/69248512639.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/8214144120.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/wijusomodajekodeziri.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/ridodezudasowabel.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f32f92d4b09d701223b2fa536a9362f4/92762017437.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/lujumafedikorinira.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/tiwumewom.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/xupesibezakidomal.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9fd34f5d4fe94703ebc1ea2ed6f709fc/82816908592.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/23703587264.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/ropakivigofaruloxideg.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/757918166.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6faab12e32---ganeruxobunawemubuvo.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/57035110258.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089770def213---15660676038.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1317f3532---vasorimabinabujaxupufaf.pdfIn PDF document text
    • http://proxima-design.cz/files/file/mogodarokumagajiferu.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/tsjjlkis8pfq0q17rdt60cc4s8/16709238536.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 16288 bytes
SHA-256: 2ad84b0433982053700ac3b33f2e2df34edd8c86ca589bda0b9a9b521bdee3f8
font_03_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 10648 bytes
SHA-256: bac0193d9d3187a315cbd8424f5012a746981468365c61a69adb036de1358ee7

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