Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6274ba01ecbda0…

MALICIOUS

PDF

109.6 KB Created: 2021-09-13 10:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52697fc86b5c721bf3c0614acfcd2885 SHA-1: 68272b04e078a401137b7a172043ac74337d063b SHA-256: db6274ba01ecbda09446ace69434a4a8a00d9fe6a78abb02293401a12c11a364
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be luring users through a phishing document to a series of redirects, likely to download further malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://www.ruben.pl/ckfinder/userfiles/files/7387735166.pdf In PDF document text
    • http://ski-experience-japan.com/images/blog/file/28297767944.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/17407853459.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1f191809---nokutagemafarulaval.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/64922346036.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/96556988196.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091305590473499.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/93449948456.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613109fad2291---nimigomejosofoxekawega.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4vtkohpu5i44kfnn5r53mrq21v/75709017037.pdfIn PDF document text
    • https://mauspro.net/upload/files/papaxafifemaguxiwaju.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/c3t8vieo0bdphr94u7n5cpcemq/tibodu.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/31809882297.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/xaxuliritinevogid.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/83385714573.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/fadodokudini.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109070456443373.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/89204023694.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/72898713079.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/32521672791.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16137578a27824---paguwupejukotaxuzudurem.pdfIn PDF document text
    • http://jsdarvin.com/files/xupaguzaduze.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/gunufitasuxalogelalasojo.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/betoxupofozaviwo.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/58601356902.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a543cb5220ff333ce9e0855302b31d75/70442228299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dls+2021+play+storePDF 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_off00014464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14464 20288 bytes
SHA-256: 9c5d64bda3d6196e1468431298803640abf33948a3488bb6befc0f898f9e55f9
font_01_sfnt_off0001790b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1790B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19122 10456 bytes
SHA-256: 27dc395c44204fe84f5c82285faada7521c92f0ec578534abe802e465943e086

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