Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3fed388c4575c3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 02:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1d986b49b18152c994a49181aaa8e48 SHA-1: 5534f04cd353f5facc8ef2faf91ab8bbe5d6ce13 SHA-256: 5e3fed388c4575c304a8bbc158b0ac0f7c8c2fc29bc965d16614652f88deb499
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable domains, likely serving as a distribution point for phishing or malware. The heuristic firings related to link farms and compromised CMS uploads strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/jsar68uhlc193dd6h01b04bf41/74312251985.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2620a0b7f---59998079674.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/24293613090.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/48886492532.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/87125289575.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/meduvotik.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/kiguzobenivapit.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85f0222da---60375139860.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/julusupa.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/cc7vq9ifadge3nq35bsj4jpt6q/jixipugemese.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/448dc9270504c1f78a93e1c4502a6d08/53287101295.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/tezojupugesuropigavafowus.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/delavuvewawed.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec0752e151---71976427873.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/52129103726.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/86099772303.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/63719999344.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/83248316468.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b09e898d2---16299886777.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/14097451580.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/16093490180.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/pepamu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/80415632402.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/tikubak.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/penixaguzaluf.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/37816892975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=madurai+high+court+recruitment+2018+application+form+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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 18172 bytes
SHA-256: 4fd8748a09b6aba24570a20680730a764e799936661c94f6ccda0efbabc57f1a
font_02_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 11492 bytes
SHA-256: c9d8c37abcb73c07e130fd431fc524f01dfc9cad6a6e2ede9a996265bbfee702