Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb73d2268ce697c9…

MALICIOUS

PDF

113.8 KB Created: 2021-07-01 12:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f816d23367d1aa5849610f1d1107120f SHA-1: 607fca6e7211ec638e6b9e49297c861ca7997ae9 SHA-256: bb73d2268ce697c92214d1b401f443bed224dd47a3c90101242f26490b79db3d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate an attempt to lure users into potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=kingdom+hearts+chain+of+memories+ps4+trophies
    • http://smartwealthhk.com/userfiles/tuvokiwagudulimevofixe.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/82c3cb607c381a692fda0b8ec7d0f835/78458617404.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55fb95dec---vukazajefuzetijobudi.pdf
    • http://ajivikafinance.com/userfiles/file/47901417794.pdf
    • http://brooklynsmokeshops.com/admin/images/file/39982478639.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca4d8fcfa---78261099625.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qgr0ecjbicu733n2bqboilil1b/46187266461.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608081ff8671f---xakiz.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/28ec4f80db80475b4d2de0ca9e9a28c1/62128318979.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/07cc0d0a5d15d2a11e32efbbec2d4975/97208664902.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609413124aeca---16062103449.pdf
    • https://laughteronlineuniversity.com/images/upload/files/vusibinonezamowexufivor.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5d7tmfs87n58ni2qep7hmg2h6a/guxerafi.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/nurabem.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/sezoraw.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f4dc0a9c1---43452342986.pdf
    • https://emmaushuis.org/pages/selirupelejapariga.pdf
    • http://bbmeti.it/userfiles/files/joketifab.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/075903cfd52118879e83a2163ec28838/dutugakisalalamorakelup.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7cd387e93---86770748835.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b90.bin
4252e413a4a4fde6fa824add537519d3a6f87c11d73cfc9e999fa019841d309c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B90 17064 bytes
font_01_sfnt_off0001883c.bin
c5f7b8b9a635af13c5852527279484c14f2ff3424cf95e84fe375e3fedf48fe8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1883C 11088 bytes
font_02_sfnt_off0001a1b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1B2 16792 bytes