Malicious PDF — malware analysis report

Static analysis result for SHA-256 c468bd8c1fec475d…

MALICIOUS

PDF

95.5 KB Created: 2021-08-12 23:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82e48cd7c4b57df71952c3bc88dd12cd SHA-1: 8d7aea8b1cd5b562d0a75d88b9f64c159619932b SHA-256: c468bd8c1fec475d0fd76968117f6e31e7eeffaee517b84d0d88f8fc8cbc0700
154 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 contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or facilitate phishing. The presence of multiple external URIs and the overall structure indicate an attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9427

Heuristics 5

  • 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
  • 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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pt8jbj920hl9i4l4nb0098a1kt/58198515344.pdf In PDF document text
    • http://tort-art.ru/userfiles/file/94208069601.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/4098709423.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f117720423---vovivisolokokolivog.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/15197928149.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8cfe333bd91384e8edffa2fc99c33ad9/87775706719.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c56cbd0465e66a8574124f399e60bb82/sixunese.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/04f3834b9e9422c510f8c7d11af5ba40/futodukogubevofezebux.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/88957114311.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddd2db34a---60271070253.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/asphgi140k4eips777bsutdg99/jevafepidemosavovo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dc2lrgt4hhgns332e88udn5ouv/sumidinusoloridu.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/xexuvugejijewidabojosaso.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0c9ecf73---89375572969.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/b8cb53bf2045f46d62486192aa2b036c/tufutumipojosupamexetisu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/39246583939.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9asvdba3e62kbh02aidtkp2pb2/33233977015.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/sifomus.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/nobasusatudese.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923f4e8ae2b---34951106602.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/981cd4e0f2a596936667d61f64dfa3da/703600812.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/xumakawibodagekegep.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210517012028_1317395847.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/44512177721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=quimica+inorganica+raymond+chang+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13464 10896 bytes
SHA-256: 9c9f6f4da2d9dc8fc3f4497f241c142181dae7f9325686885bb7bebf9600c7c3
font_01_sfnt_off00014d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1