Malicious PDF — malware analysis report

Static analysis result for SHA-256 310d5adfb90b3b65…

MALICIOUS

PDF

78.6 KB Created: 2021-09-02 08:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5645f9ac7e0f5c83b429a884feec80c SHA-1: 3838e3bef90fcb103cf408bb8dcb4ec6f6c76801 SHA-256: 310d5adfb90b3b6594e34e38a8532cf1bdabe3086d3abb4c36410a5ed5cdcf01
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially malicious uploads. The presence of numerous URLs pointing to compromised CMS uploads and disposable hosting suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=indigestion+from+eating+too+much PDF link annotation
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/fd81e736fe30dedaa51297134bad37bc/wutev.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/57643012032.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ktrkmmmngdqgr7q1vbt0u6na3d/jebepadotazadexibiwoxix.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dc05e28ff---97471707191.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091386b7e44f---51440688064.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/98127245370.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/57757978773.pdfIn PDF document text
    • http://chinazzjx.com/d/files/55358113120.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c38afbae7837541e4bca97ff2bb13e3/buvisezoxuluwabulu.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/xilorujevolopaworofosu.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/suwatawubijekinotetito.pdfIn PDF document text
    • https://mattress-leader.com/media/3370413657.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f582000e5eb---ludukevaf.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/ritebozexogisujokowuninam.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/52430346428.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/8992268097.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/pigesimebisuwowunufozit.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/887f37a2e6165ef4ee4a4a83df67623c/teregukotesaj.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19b0e84205---nepipov.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd08364e51---renavewedile.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/96b0610f9dfd2291f43c8f13a83558e2/47197585417.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/lu1jsg3umo4cqmbbau1mhhstn6/bomularusufuwexazuva.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/80043296607.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_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 17052 bytes
SHA-256: 91265ea437624ee9c7eeb0a1972b57c9d93c577929ebe3fc88da4a83d5bf948b
font_02_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 10928 bytes
SHA-256: d3e1afca6368463f4ce792e05f98d86330f5a2cf256b6a45e895412818a4c6d0

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