Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e541bf4abec9ff8…

MALICIOUS

PDF

75.5 KB Created: 2021-08-31 16:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09764806bb3d3917d186bc203ca57af3 SHA-1: 3f6fbc8fb22ac1ead0cf2d1586d4c7029635962b SHA-256: 0e541bf4abec9ff83f665896c3dfc15ce509db34196dc6775e58ef93b10bd3a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://infrive.ru/uplcv?utm_term=top+hd+movies PDF link annotation
    • https://kermoulin.com/userfiles/file/18788841932.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/84546895548.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/lapokivufetisiguvajumevox.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/makomamitokedi.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/4985042148.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/butizezozugikigutejux.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/28424358829.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/547de97840727e2ad1283e7f2159cd07/56780342444.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/sagobunisukadimijizeze.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6e45860f---sitedimawosel.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a429403e7c0---52344353598.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1627806496.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161060fa65b2d2---gijelozifaji.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zezedebejod.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b92cf3e8b1---delarudigawit.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/00bdeff6a98969f4f3722124835cf448/pisesogenigokaxi.pdfIn PDF document text
    • http://kotolantopeni.cz/file/12609962637.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/19901680263.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/virelulam.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092baa216166---7113125926.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/4sgnc2ul393k3m12v530ml7gh4/82775736248.pdfIn PDF document text
    • http://www.edgartownschool.org/uploads/files/fidiwelis.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/nniriombifncjbtrplqrsqnu93/dasekafatasijuxokumav.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c97c0f8937d---33220814306.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/81297be90318d256a1ef7f3995d3be05/19418174393.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_off0000c71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71C 10176 bytes
SHA-256: b2693db495ccb87e7140cbb937e9651d5d2ed3deccca007eae09cdeb3becc889
font_01_sfnt_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 16440 bytes
SHA-256: 243881becd188a1d04011b58d1a64fdca648274f44b3088f962984d39111f742
font_02_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1