Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc222de28db1d77…

MALICIOUS

PDF

92.6 KB Created: 2021-07-22 13:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e0ee660f73e7173ef8a7b1712637c03 SHA-1: 681923ebbc006f7803f83bb0e71fec65d0095eec SHA-256: 9dc222de28db1d77341553bfaf94c508d76342030243f709ad83c0bcebd93ffe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm. These links are likely intended to redirect users to phishing pages or other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bfe94b4168be0aa2fbc891209dd27005/lemixulopapagu.pdf In PDF document text
    • http://forglass.sk/userfiles/file/kufivoletoxekinalude.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5123084b---somulu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9fc88ee6---67803270125.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/palojinileges.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/19156928751.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/wofimevejokubejejalukafef.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aaac9d361be---fikudise.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/midukewoxaguzawipam.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82387499e2---vizajoxokonobiguwisibep.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/bf333cb6475e57c634a6be690134d0ab/xumurotokotegaledewidu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19fa310f1---kepidaga.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e63771e150776fe2bfdffa99c85c23c5/76844263312.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/xukerupejepojuzeto.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/155a6cfdaba1f6a9575bc1fe9d2fc33c/pefodabipugozezula.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bdec8556---kibaketiwutupu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1fd303de---vukedenezapuwu.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/61696557445.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c082dcb8---54132737503.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/niritatexuzekenu.pdfIn PDF document text
    • http://egonseetour.com/FileData/ckfinder/files/20210619_374EC3A877F41894.pdfIn PDF document text
    • https://wagaskar.com/media/45328085635.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/dogisuwofetuxutoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=polypeptide+chains+are+long+chains+of+amino+acids+joined+together+byPDF 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_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 11452 bytes
SHA-256: ee28d52dc3f0edf731f4fb10651fbbe5653b65ef835b7a51a8a119dfc56a3a1c
font_01_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001387d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387D 16536 bytes
SHA-256: 9991c13d2320702fc854578b621c67f2ec50f05aeca59c574b492bac706aff97

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