Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc990553a6c34e93…

MALICIOUS

PDF

84.3 KB Created: 2021-06-12 15:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 028181299e4f47f95c648dced03c1d9c SHA-1: 5e977fdf90d4065bf3ec3a34b4dbbbeebadbb45b SHA-256: dc990553a6c34e937280e69afbe64a9ba3bb1ed94c1c0931e8fd19f3cfee634f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=word+problems+on+lcm+and+hcf+for+grade+6
    • http://cosmic-kino.ru/sadm_files/34476638813.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e22a4a40b---xawudogaxuv.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/55ace9381abc568e123be89135533d6e/vituvosovofomuronimel.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e960c69173fffab78e3498b7e1fe037c/tepetiduvumironu.pdf
    • https://alamansyria.com/userfiles/file/zexafudogixapovi.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ff1441636ba399af274c436779acfe50/74655666928.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/1916ndfr8n6n6kqm01j6qcfc1m/61857736026.pdf
    • http://s-privod.ru/userfiles/file/jitisexunitogokutobanowu.pdf
    • http://shinies.ru/img/lib/file/40881041575.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/gatib.pdf
    • http://elitvorota.ru/f/file/puberojokijetatewomijobek.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/5e8060854ecd76ef463cab2501db8ec7/rajazaxununupajitalikime.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a42161605---dulotopozaxuxetite.pdf
    • https://stopserv.ru/files/file/38213165945.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b33dbd5d0dd---kujidulutudawelum.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d05e20177---nubidabip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000f441.bin
40fef61f565e0221e2b5bcdc23bc7120007d4c461251b291ffba3a58b0c72703		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 5876 bytes
font_01_sfnt_off00010822.bin
983df2fcc33466971585999f07ef4b2e59ebe18dd9cab3f54375d0818375b2ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 11224 bytes
font_02_sfnt_off00012ea1.bin
3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA1 16096 bytes

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