Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a55fbf5268e8c33…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 04:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e99bfd7cc6b2d9b5fe39aca6a233629 SHA-1: e64a7d4e34cb6bb733facb57d0283a4967fd30d5 SHA-256: 2a55fbf5268e8c338a7ce7e1e80ed99678ab1d0a2fe307ebf6887d585b6d7f90
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, indicating a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://irlanc.ru/uplcv?utm_term=gymnastics+for+4+year+olds PDF link annotation
    • https://ahirealty.in/admin/userfiles/files/mujibabi.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/zamobumojuxikugogojed.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d57ed6d4c33---gupogaxonifowomagizigub.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088791014963---84163516190.pdfIn PDF document text
    • http://flexa.cz/docs/file/nalitijak.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d67e21d3798---40988113019.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/junipivedofemibufibibax.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/gakadipegakeguxupopuxeko.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608169558e3a2---zivedepoziruwifole.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9b3238c61---50469060862.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/de0780cf0b61e2fdc98d92f118bc0147/72364482161.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/287feeffb26a9ee160a18955a45c8238/tadaruxej.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210619_202019.pdfIn PDF document text
    • https://edusfera.pl/upload/file/fodazazanudejijexokatar.pdfIn PDF document text
    • http://ezibra.pl/upload//file/19957652094.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/12232570058.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/pusudomukipuliv.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f2be541e---77244248679.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3445bae7f27ba1c55c26e3bbe3f5d855/11257167222.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/m96tg3epfbd80uqlcil9u3jt31/49573270746.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2f326aa6---vogonapijiritixo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bced3b119cf---13344101475.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/folufidof.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/dowemebiliruxekitiz.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/30395698460.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/47769850604.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_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 17868 bytes
SHA-256: db74a3c08435c208487d7c5981976b418b743026c26729c3440509d6998e7f92
font_01_sfnt_off000126c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDB 10868 bytes
SHA-256: 2768f1e5e7bd92bce77b7f12691b78ab8725b7f8198e7da59e266d9a68554575

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