Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3021e0237065d9…

MALICIOUS

PDF

88.3 KB Created: 2021-07-24 08:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 424d4433659288e5fdc2a6da93a60f37 SHA-1: 39fd6a37efae43acbdff820d866672addfb683cd SHA-256: 8c3021e0237065d99d649df88b7dabc4c203e6ac00b32b1d1e881405d9284ca6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://salkim.com/userfiles/file/lubewibudevumipazorido.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/usp7tb7ffe1tsscf9k9bcpk293/72741194736.pdf
    • http://kripasec.com/userfiles/file/31206692397.pdf
    • https://baxsporthorses.com/userfiles/file/kinopojedakivavu.pdf
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/vezofonomawuvunazugijeliw.pdf
    • http://ramsteinroyals.com/clients/e/e6/e68fa2bc61b75b8a06766e25905052c7/File/72830287801.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9prjdcmlh0n9di0j24dg867kbe/jetuverogivepegarikuruzi.pdf
    • https://doosradashak.in/ci/userfiles/files/pefolovifuvakugofasuf.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7393ae9792---bamimegogazeburubo.pdf
    • http://msslink.ru/userfiles/files/53419840826.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/24233664520.pdf
    • http://agcslohian.com/userfiles/file/45865403832.pdf
    • https://estoniapools.com/contents//files/50786368031.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5b8cda51---tupofatipasesewexisa.pdf
    • http://pspectr.ru/userfiles/file/5203566674.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/2a7e7f987405809cda1cd9c2f5080758/44170516950.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c8103d84f4fc2d2364f0e3f14b99f2ca/bowezisaxez.pdf
    • https://mimpiindah1.com/contents//files/87561323726.pdf
    • http://morethancars.nl/uploads/edytor/file/ruvowezolikaxikulerefovin.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/11f366047578afdd0893b776b43582bb/19787640627.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0118f85b01---38742583214.pdf
    • http://theprintfactoryvietnam.com/uploads/files/38785022746.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a8760e8afdded33a67e13366c0857355/zififevakugimefel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+pause+ultrean+air+fryer
    • 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_off0000f533.bin
8957dbef5d158559622c5a98e41d1fc3815614d86de6eea792ae59a1745f4681
pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 17340 bytes
font_01_sfnt_off0001224a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 16792 bytes
font_02_sfnt_off00013a61.bin
7a4f34255900449fd43467e24f41fab1a2cc4103d10ab4c9b1c0fb8ccb8ea87c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A61 10640 bytes