Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc86d8021e512eb…

MALICIOUS

PDF

138.6 KB Created: 2021-08-22 05:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7cf8709f5af10721396700c7651738e SHA-1: 1ea02af67e6fc142192d1c0eef5bd089a2a45152 SHA-256: cfc86d8021e512ebab27b21fea881b186ea82e0b1cab840c7299f61625176a55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and link farm indicators strongly suggests an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://drafthe.ru/uplcv?utm_term=physiotherapy+in+neurological+conditions+with+assessment+and+treatment+protocols+pdf PDF link annotation
    • http://humanitool.ru/userfiles/file/31800753367.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119f236529---40792482749.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/pivisetobu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/48bbceuii7pgas86rae4q8da27/18656228905.pdfIn PDF document text
    • https://aedwea.com/upload/foto/lofipumidebagepig.pdfIn PDF document text
    • http://efrex.cz/files/file/28869453845.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607260bf02837---2519078588.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb87af023---38548090270.pdfIn PDF document text
    • http://saimiri.name/upload/file/rukupidar.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/49150912544.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/5673444fd458b7bd53625e76c0c9fe61/jatifedonux.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/s7t8cn2pbsg8af4fpfei8uhe85/55763949666.pdfIn PDF document text
    • http://acril.ru/ufiles/files/76692619485.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/lapigalajiviwun.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/71657327100.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/q9mnsau3dbv7occf65o7s32a53/duzujefakuwuf.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/7de0d9d31777843dc7d1119792d73faa/tuvan.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/rugefones.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/uh7ht1d17ehrhq1qft5du8bthp/pepurevogugi.pdfIn PDF document text
    • http://newo.ru/files/files/29631910928.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/66106197760.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/godetagafiwonevaduseg.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_off0001b786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B786 11368 bytes
SHA-256: 20d8e503e966a2fb4c63dd2695b1666894b6c3abd2fa63fc6b5c17f1a1cd1eea
font_01_sfnt_off0001d205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D205 19500 bytes
SHA-256: f02e0f51ce5f8ce7b17771f855ff3ebeb8f7e3488aeccba5a9322e9484e18d91
font_02_sfnt_off0002039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2039A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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