Malicious PDF — malware analysis report

Static analysis result for SHA-256 955e8dd2b665291a…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 01:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12baaf9f7b687139df394682c02b9ed9 SHA-1: 020bd29b4bde2ac0e3be7d10948c983f1957c655 SHA-256: 955e8dd2b665291aa935dd6159dc3dbdc8d7d12bff8cc296eb4bc588218a43a7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/40b614d1b00bf27dcfa8b1e484875a41/kafexixoxunolok.pdf In PDF document text
    • http://mastrodibaglio.it/userfiles/files/tawevon.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b320689a95404694e5f3e6c15fd52704/68586619569.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864294d610a---zilipolipesufewaj.pdfIn PDF document text
    • https://unosms.us/userfiles/file/sulamejarebaxujitofa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4e0m0ottm8nmbaep5ol9r61g23/bowowomusaguvafowukegelu.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/busujigedu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072c948054a7---salevesedeligodef.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/9stvju1kfvnvhqq991kvhlvdrf/89527011065.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/jotit.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f198e3729---90740130540.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a142de01279---93239366117.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/634e76f1aba6d8f027b4409739691055/12379549028.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3cad67d62d6a3d683098f9f474e95ca8/22037053563.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fa129778899d68a0818f60cb77198a5e/nevekogisumewafilaka.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c4b649e950c96c57f748c25ac5a36fc5/denowajigomobe.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/fowalusosegovigalaroba.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/14al8mhqhmde1kd4cjtd9gofm0/xevajopowowimawe.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b545be8f4---19408876375.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609410fda7dbe---jawokixanemopapetupi.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160781ad8591f0---pimobupogakub.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/19507472584.pdfIn PDF document text
    • https://bio86.net/fichiers/5591927532.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/5002560193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hr+subject+questions+and+answersPDF 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_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 17244 bytes
SHA-256: 775c6601829772fb211e8655c1e1aafa8228bd90ed488cc661fdd99e934f4b41
font_01_sfnt_off00011944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11944 10912 bytes
SHA-256: 110bb420a1dff6729bcf36f0a501c3fbc594500193c0e75143f8db02db4f6d7e
font_02_sfnt_off00013277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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