Malicious PDF — malware analysis report

Static analysis result for SHA-256 984b59ea0c5c21e7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 22:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8fe3e403a7b20edab91ffedf4a4018f4 SHA-1: 8fff62cf9a538539c64f179684f938688b8357ff SHA-256: 984b59ea0c5c21e75738ab61cf2e93053c6f21a2de7e91a88ef058168dc10852
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains, forming a link farm. This suggests the document's primary purpose is to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=brooklyn+decker+just+go+with+it PDF link annotation
    • http://tabouligrill.com/ckfinder/userfiles/files/85369176137.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf36c4a43e---sovitunemawevet.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/91488339202.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7760d7554ef52c0f879eb7ab6efe012c/33273521803.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/93886461549.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/nakob.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/foniza.pdfIn PDF document text
    • http://rs-entp.com/upload/file/wajegepofi.pdfIn PDF document text
    • http://imi.vc/upload/files/datotipop.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/pisilidiriwokijugu.pdfIn PDF document text
    • http://llux.vn/uploads/files/gajelifamabo.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109060655117341.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/28192431814.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/44151001155.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/beruronutemokonule.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/jasupuginanotejelekewezi.pdfIn PDF document text
    • http://orenprom.com/img/account/file/luxajiremejujorosubatuwa.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/pamavuzadukonimikikiz.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/5756209674.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65d1dad9817d6d292b0c7decc9babea2/2419206222.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210906_140145.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/95471324219.pdfIn PDF document text
    • 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_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 11064 bytes
SHA-256: 8fd900375a41903808fdbc419c6f4c54fff87a5f07e95a2211c96550cdf7af89
font_01_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 18348 bytes
SHA-256: e92b19759b8604408592f6b9954eab0e504bee7fb486128f995966ab0144f66e
font_02_sfnt_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1