Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44a891ad370fda6…

MALICIOUS

PDF

90.3 KB Created: 2021-06-15 22:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0c7b8a4668e8071d3835a86e369373b8 SHA-1: 419c032f7eadddfc424fdaf19e724e075e1e6fb4 SHA-256: b44a891ad370fda63b156bec1a67e3d41dafa4e02bee1461bb69b106cfe3062d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to "kcet previous year solved papers", which is likely a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/uplcv?utm_term=kcet+previous+year+solved+papers PDF link annotation
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/b8p59f8eulmmc56771p0vdg8r6/64150644898.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9d32c794c---32574882923.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/73258028676.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/k1cq1ff5n8k45hp2otj5tr0jrt/lisedonorupajojudiz.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaddc6acc2a---xadanepimokoniram.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/940f708c917aa55eddbac237103a0469/mosoxotaziso.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/vojowoxofexumo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wezav.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31272efa17---35890082225.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/44d8cef5b8c0f26aac63c33ff16d4441/fomuxuzekamos.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/11a5a6706e1787f27c7df38704af5824/tifinip.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/zemarenokubukinuj.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ea153573---pitovogafivawisorag.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c490cdc1069---67354198786.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4954055a5c---gaxafitimel.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1a640a6069a7e5223221c78beed50159/mizatojikixobirazatil.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6fcd816f799f233b7d716cd923cb997a/fimogotufapetumu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/76115802282.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000107d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x107D6 8000 bytes
SHA-256: a0d09b8e3f5dcadffa2b3e1a263ba0b3185ef217ca16b10ee23b95c5f9a4b6b5
font_00_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 5196 bytes
SHA-256: bdd0c97d9ac07ea806c7e168f143c26ca0b00c9a33a8e5f189f8e7d4e0291c31
font_02_sfnt_off00011f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 10900 bytes
SHA-256: 9a1593c8e69d67ec74c642c2ad505c45c5df6809f308d95421a062743f2a9f7e
font_03_sfnt_off00014477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14477 16188 bytes
SHA-256: 6970ea6d2ad6217a024665c228b4b268dda1984683972712704b854b81cc4be4

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