Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bba3100dc9d051…

MALICIOUS

PDF

83.5 KB Created: 2021-07-09 20:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ac1cd9de499bb367bb57b77c56b2d06 SHA-1: 0ac74d2448426778b8e360253aeca7218801f4e9 SHA-256: 88bba3100dc9d051fc0b8dc7b86c72007fc33590c71e81e581a7ab7793f1df39
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to facilitate phishing attacks or distribute further malware. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates that some links lead to WordPress upload storage, suggesting a pattern of exploiting content management systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://naasschoolofmotoring.ie/fckeditor/userfiles/file/74687378180.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c315b076f7---59245489711.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a6a3c8f8a1a4c5091008f6eb2d963fc4/59190216088.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1918c84f3d2f5a91a05003f7c7cbd1c4/4727590842.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a32c4de0f5c---64844135147.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/478b214c6c3044806d2aad419f2aa96f/98400561513.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/35998719884.pdf
    • https://beytarimcilik.com/admin/editor_resim/file/17720342826.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/i19h1evjdeam70lgf4da28ta6j/pedaxonazunofiguwo.pdf
    • http://noxsun.com/jingkelun/userfiles/files/20210630072722.pdf
    • http://lysfyyy.com/upload/files/89640201813.pdf
    • http://ajtoablakcentrum.com/_user/file/kiwonazalisejeraw.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/rafebawetazo.pdf
    • https://cvsc.co/userfiles/file/6779787420.pdf
    • https://familienarbeit3plus.ch/userfiles/files/76091705282.pdf
    • http://muacuoi.vn/Pictures/files/44600161702.pdf
    • https://ispartaorganizasyon.com/ckfinder/upload/files/xerabulajolo.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fe8c77cb4f6e59609e192f717088809f/57447635095.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609229eca6296---nuduxofajejitig.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/wajivis.pdf
    • http://gomientrung.vn/uploads/image/files/ragex.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ac3625eba---lijixelatikunomolu.pdf
    • https://mariellatriolo.it/public/file/73291248121.pdf
    • https://anthonygillant.com/userfiles/file/83129941755.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=questionnaire+design+in+research+methodology+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 16792 bytes
font_01_sfnt_off0000fb04.bin
a8b298b4671b73775aee6c18db53177174ccde4e942753e3be7cb23d118b6bac
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 11340 bytes
font_02_sfnt_off0001156a.bin
a9335d7d6e95cfe28f46cdd3ef362447b77741beccbdb767520d9c31a854f63b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 16756 bytes