Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bee24fc00dc350…

MALICIOUS

PDF

93.8 KB Created: 2021-08-09 09:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 62e6581fc402cbedea983bb665281cb0 SHA-1: 139f45477f240dee109e8a19c6f49b5f7a3c44dc SHA-256: 48bee24fc00dc35047ebcf37cdc13de129aa4b69ff84deec4a67865eef0217d2
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=class+10+maths+ncert+book+pdf+chapter+5+solutions PDF link annotation
    • http://autoscuolavalerio.it/userfiles/files/siniketomaveje.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f8530dfc2e984763cf26e9c7feecc2e2/53334068958.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210703_71824E6B426ECD3D.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4bed90567d0b2e3eacdd40106b8a70ac/sofozajusikeforopegoraxa.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/16924187491.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160851649bff40---nilexinefute.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/nefavodak.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ea3de9acb---lizoroginodujasuzipezi.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/29302787297.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/14126598567.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/49149936869.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/pikoxafababa.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/61401326623.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/sijk7tkld0plarq5cictkaj8bc/zemonesokut.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44520e7f3---75975594230.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/46da7865820d0a2c475692b5597a1726/55911955309.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/furevibuf.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af6bbe510b7---94950011371.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/86698914416.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dda40d6054---zegedajelanekogeputuni.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607764ea3ef54---pupimulidagifopud.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/2929194740.pdfIn PDF document text
    • https://digireg.pl/upload/68462424595.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/96590392770.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_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 17392 bytes
SHA-256: ccb98534e62ae02e39f95c3af4dd7a18d6f22ce34224669561312c9d09e13ed0
font_01_sfnt_off0001354d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 11556 bytes
SHA-256: 2c55e97127020d5b11185a524d851faecc7b705ccca18e7aac2064d81dc7dd20
font_02_sfnt_off00015060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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