Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fa501306fa685d…

MALICIOUS

PDF

66.5 KB Created: 2021-08-12 23:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c92aee6310f1ad7cf9d16bbe79352444 SHA-1: b6d4306ce2d278b8e2a795c8da3a143b89e0a978 SHA-256: 89fa501306fa685d4f58adbedc86f0aaa2b028803996898aac4c635fb1cdc6fd
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable hosting domains, suggesting it is part of a phishing campaign. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, as indicated by the ML classifier and ClamAV detection. The primary attack pattern involves luring users to click on malicious links that ultimately lead to malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9771

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://irlanc.ru/uplcv?utm_term=waec+biology+syllabus+2020+pdf PDF link annotation
    • http://hodori247.com/uploads/files/bavipuvoweri.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5388f5be---bumesaboxad.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd73bdb87b4---pakajetizojeroz.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/13176043845.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/44056248534.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609da14ef1797---siduzaxuge.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/h4efb4jcmblsb2kvl0cpi9th65/53632189799.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/72669710013.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac813dd327d---137144091.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1365ca56---47990220666.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160945ea70f652---dadobama.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/231ca35ab42ac0ae939930a2947ef204/32055957455.pdfIn PDF document text
    • http://a-pluset.com/userfiles/xekegifelifizopewa.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a1ddc9166---4711029717.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4b9fe3sokorqgnsghosrb6k7o0/kunewulijuk.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a297c13912f---77101143534.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/53560784858.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/97977021720.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/94df878b3c0b203578cf624d60bc08a7/xipiremuzazo.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/u43tmn9b7r0cvoak0i7nctb7tq/20660717015.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/munevututejadaliduj.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872098495c6---98463186496.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/96633617027.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/bbg1mh2o2pisd13nvgta4tvgm6/81621249729.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 17040 bytes
SHA-256: 60fee92480997c19c19cfc2b278f74a2fafbc07a124a32cad3e3627aa49bd1f9

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