Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9696cedffbb04c…

MALICIOUS

PDF

69.8 KB Created: 2021-08-13 12:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5002617b886debc8c186970f1ebb4b5b SHA-1: ed6b1706251ef097558fffb451480e51b5dc646d SHA-256: bb9696cedffbb04c5659ac5f098c3219fc57c1bb73d9c1d87f8e9f412571c722
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were directly extracted, the PDF structure and link farm indicate a likely intent to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://novichiha.ru/pic/file/80248978680.pdf
    • http://kfbi.ru/content/file/rozixowum.pdf
    • http://cooperclassof1970.com/clients/9656/File/76731760170.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/jirutikugoxemuponik.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/moobq4aqocbcjlbua9uumpk706/jaluwokenevumipopekag.pdf
    • http://cnex.cc/images/blog//file/limitigiwovuwoso.pdf
    • http://kalmi.ru/upfiles/files/fidovoxuvifipakexum.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609860ab93c3a---14811744619.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/faturakelop.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1610891593314d---jonin.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/45981b645b9ae7bc6eaa1c57a8f53830/30831971690.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ebd9fb061b33ea8eccb443ceada3ca63/mofoduzosul.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/safek.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/21444929188.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/21f4ed52775cb817c1feb545d0facaac/dirapitumidanoz.pdf
    • http://ippinnudon.com/uploads/files/nagobufunobudez.pdf
    • http://gemculture.com/userfiles/file/betalureke.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/077941f8932544f40460863350901474/94600599597.pdf
    • https://warungmimpishio.com/contents//files/jigoviz.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67c8bfe53---perowolekoforijamotikated.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/53866446814.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/kodikigula.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=algebra+1+lesson+5-3+answer+key
    • 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_off0000b527.bin
e3f49b91589097ef766776dd3b8f2e02fdcf2e03ac58f22cc932a5a4246d3c62
pdf-font-stream PDF embedded font (sfnt) at offset 0xB527 13964 bytes
font_01_sfnt_off0000d7d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 16792 bytes
font_02_sfnt_off0000efef.bin
a92a396a1474174f23511c8675fca5250e026202b813963b5e213c02073afaf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 10896 bytes