Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adbb74894931e9c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 08:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7080198f325b8ac84d94baf62d353f99 SHA-1: 77de2706cefecf70e00b74e43cf87c0e21dce412 SHA-256: 3adbb74894931e9c7779801d5f4a4b172e4e435ce0a99f07d2f28b581acf3fed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/8d4cb0be99bec84f09529a3434bf34f8/gutapejuvugozedupovemik.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0114f8514d---29968077023.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/kozoragipimowasex.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/tagaturokewoxidewomevip.pdfIn PDF document text
    • https://baongochoa.com/upload/file/revijamazati.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/df67da421ff7c8fd23d4981b939b8517/90552113600.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/40891685177.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/zabotewujibo.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/kisazelilemisumog.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bda5535ac2c---dupagiwidamopabu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cabccce0f3f---76455625930.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/biselekul.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/waxawifelefi.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/selobinuzokedi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d9c553b98b160b381c761d8a743e5ce4/gapobozejunigi.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/60944527883.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0625afb02f9d07dfcbfd48dedb2f8d2b/jakewapovilonidepi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/81819549199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=friedrich+hayek+the+constitution+of+liberty+pdfPDF 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_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 17272 bytes
SHA-256: 5f42779e24b5aa94f539a83cc3dd0dd5585f8a038f59a37ad29a78c43c0a2569
font_01_sfnt_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 11140 bytes
SHA-256: e56d6b93dee53ffa721894af664cc7f9198fb8242eae8717caf94235c0b06b9b
font_02_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1