Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fb87f1df9f88b1…

MALICIOUS

PDF

90.6 KB Created: 2021-09-04 08:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88f38840dc5bb1199ad919b45a08153a SHA-1: 323b744f920df5d9a2f9c93adde2d88251bf0229 SHA-256: 20fb87f1df9f88b1e02db3e5104166bf2a914df3a70d77585c850d90c7d7378f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The file's structure and link farm behavior indicate it's designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/076ffa589d9eb39f72dedfe222a1a2a9/vijilomupamudawis.pdf In PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/knddimq06mt0r0vpuhos4996ta/80999468528.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/50884001629.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/fegoro.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/dosomemavosafubowim.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/vivaloxo.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/3559675105.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/38335646859.pdfIn PDF document text
    • http://orlickachata.cz/files/files/zajesupapoju.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf67880a6e3---mijimaxisetesopeniwatumel.pdfIn PDF document text
    • http://pk.mo/userfiles/file/bijulebafanotaw.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/wuvirevirurejugexijinawiw.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/girekejep.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8a6272d03---fejaxivepebomo.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/vuriduliwulazej.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/66277335303.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac09a85b4e9---25285044298.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/31718123876.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/buxadememi.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/nebamobaxumotisepaxixer.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/kevivukedoke.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aca949c67c9---26765996349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tutorial+audacity+bahasa+indonesia+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_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E2 11036 bytes
SHA-256: 163bb27a8383c3fab54a425efd76d2b42349eeb8c17e3122379b12466eb2b706
font_02_sfnt_off00012f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4B 17320 bytes
SHA-256: 487a5014cc6cec6c152c828ef0870a9fb4466dd6eb038db9c521cbd7f574cb88

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