Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b23f3482c32d488…

MALICIOUS

PDF

79.4 KB Created: 2021-09-10 17:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da3bbfabbdeb3a87d8c1a583e4c0f6ea SHA-1: 793b09fdb04e493481fe1f978dec7f5567561296 SHA-256: 6b23f3482c32d488bd8f95acb280f542221212e827b5c4bf9e3c057cb451eb37
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially compromised websites or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://myatkinsonfamily.com/userimages/90763356596.pdf In PDF document text
    • http://learningkey.org/userfiles/guwafabotatuxu.pdfIn PDF document text
    • https://samudra99.com/contents/files/vitozuxepuwujabikaja.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/34154230165.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138401cb922c---nonalonubosutaromezuv.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/77430629803.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/41868348519.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3b746a2b---gifoge.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/luwukidizawirawuvoxitaxo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161342468bdba5---89330137452.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/51959603790.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/vibasizesemezavagibisega.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/kamonisutovelalidas.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/86246442231.pdfIn PDF document text
    • http://halanmilk.com/upload/files/28124432847.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/77019396131.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161323a8bac358---vakewanuzimizofupatuk.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/70299436875.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/4625884562.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/fuvawel.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/verasasifawoxirevevekefe.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301972d0e35---3452043199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=void+keyword+javascriptPDF link annotation
    • 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_off0000cfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA1 18280 bytes
SHA-256: 48b323383efc3b8c423e2059546638ec26c26c34869a9585938e73982c02490e
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 10816 bytes
SHA-256: eeae449169dfa07822766e15a2e0a6e58bb230bbd82a854508009047a3453972

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