Malicious PDF — malware analysis report

Static analysis result for SHA-256 82df65d309bd39fe…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 22:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afe3753696d080ce13e9f797914fdadd SHA-1: fa425c3891ea7a8a98fd1aed35b5f672657e5525 SHA-256: 82df65d309bd39fe0fea5133c24e6e572c3e91d2cc22a90c46310686263b9949
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=how+to+know+someone+viewed+your+instagram+profile PDF link annotation
    • https://jooli.ru/ckfinder/userfiles/files/91429242173.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/nofebefogudanokuga.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/95675360548.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/nazimasaxesu.pdfIn PDF document text
    • http://baove24h.org/upload/files/juvivixegu.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/gosedutenujomo.pdfIn PDF document text
    • https://mangallagn.com/images/file/73835101578.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/jerepudomijufuzipove.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed30bb108c---74826593961.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/88347390925.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/kibifetajaxibo.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210904091455.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a04ca8069---38852423832.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/38714481929.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939d29c9e8---kuzato.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/60647757581.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/98223629903.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/sagika.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/36934222376.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/29968123610.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/fogezigijatiri.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/sunosijeb.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/mavitelulimefoluzivewoti.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613850b124697---neregukumiwuxi.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_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 17864 bytes
SHA-256: 74e686b4dd1bcf48e14abdec58acb6a2237ab6ccaa0859e3e9c58deb3434344f
font_01_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 11292 bytes
SHA-256: 27c0d0b90b4d1f34c7152cb57130e7f2b33f934ec25fbe1e9c6b15ccbcfb1679
font_02_sfnt_off00012b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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