Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7a914bd3ffe2cd…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 06:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c9ce9a9209baf50e3c806bb4020610a SHA-1: 17c9943da1a2e07fba786a68c4e3b755fbde7c6b SHA-256: 7c7a914bd3ffe2cd17170a83eb4fa2e71500d762103cf375f7fd114f57906765
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to lure users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. The file's structure and URL patterns suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb4bcb6bb---78975647055.pdf In PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076e62054631---3681070480.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9760a2125d---1300973475.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/kefadigusonitajavumixaw.pdfIn PDF document text
    • http://unibox.lv/files/text/95145793529.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/85109836036.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/zatuluxopaf.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077beccbf25c---23692246358.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/giwajebebonagotas.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/talazajikududefora.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tktflrg4tlae08i1dlmilejp5n/wumowoxo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1d45b594bdfb2ca088d5085509eadbda/reporanimixesapitaka.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081d79eec49f---49242133765.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/84786064109.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/d9bfea6ad53787f0e2416f1a34f2f2db/tojavi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/op78p4pu58mq85l6unhep639ji/72165407262.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dqdpsjgnhtglvboa60sb23lt02/rubobo.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/nakitifijok.pdfIn PDF document text
    • https://digireg.nz/upload/98607453017.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/xituredibudumiro.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bda7324bf93---fibapubaneruvenamuwapaga.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6988deb31---63218376757.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a0feb1da5---51865025208.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c2e5c793dd1abdbc1cbd079f94eb9349/50031140948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=construction+equipment+pdf+free+downloadPDF 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_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 16588 bytes
SHA-256: 91431a15e26fd94227bce58375a60ec700628f4960e6edbc2b2814f773fa5962
font_01_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 11144 bytes
SHA-256: 2627e4eaaa42419bf684c8e7df7d0fc3feee1e821cf3381f353fe5d656eee0d3

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