Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9ba5b04fd88707…

MALICIOUS

PDF

114.1 KB Created: 2021-08-15 20:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8892cfc895060b5de6ad3c975c715085 SHA-1: 2c42e9fee7fac9c42f988d8cb60f044155225601 SHA-256: da9ba5b04fd88707ced531b43506615c5a66984817b02e87843dca6b3bf53a6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/43b8adc497c6cda6820c372e7df1febd/tupalexujivoxabetimuze.pdf In PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cebce2555b8---noxamilexezeturupodo.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/tesare.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8bf7b5d9ac36e05506b7d89e6f1a9ff6/45162734612.pdfIn PDF document text
    • http://24cvety.ru/upload/files/24030768000.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lkfbhd1tvaf4omn7aakvr4letp/vaxugedakiparufobesaveno.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/vemote.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c1c92a8ba---foneroliporulazis.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2991d70b11---gojigol.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/20774147271.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/15230211558.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a395f2390---87802771830.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/12732630047.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/nidatisufafikijasum.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c9307cdf0---68173443080.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/noked.pdfIn PDF document text
    • https://masukpt1.com/contents//files/71794925754.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0db4e30b---sapokizuxojojepituxe.pdfIn PDF document text
    • http://fittbike.hu/files/file/zasinavud.pdfIn PDF document text
    • http://uci.ir/userfiles/file/nibukafidobekel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=should+you+stretch+a+back+spasmPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC6 17076 bytes
SHA-256: 661f74ea574452f9102087aaa038bdeffb868072dd9a0e3a85d6caf4ae2e7391
font_01_sfnt_off000187d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187D0 11104 bytes
SHA-256: 620a49fdc5992bb5595dddacae02c49a309fcbc435a09d76b7e1020fcad375ce
font_02_sfnt_off0001a19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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