Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49cda2662a0cfd4…

MALICIOUS

PDF

87.3 KB Created: 2021-07-25 16:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b05922b7612ab331e6b9f59152078217 SHA-1: abf0815292e2d84630f2194b03de5e2de380a268 SHA-256: f49cda2662a0cfd46c4eda2189e9b01e9e73f71c1ea928b1a4d6cc2a84cf9ed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://razredna-nastava.net/files/71884196284.pdf In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f55099ca---notizan.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/307efc974763115c2d49c0604a965493/50678657364.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ddc25e1a---52479554336.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/40430664119.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607086ebbc799---99514199125.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/56582080169.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/sodigta5174bnbjfuqm9ubanl5/vuvekudawagi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fab92cef275---13271410919.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818deea67ad---25523684724.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/28350068529.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4cef58daae2394458f1e6f7db84a7826/duwanofibazuka.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/finapagedulapupemarerora.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867b392dcde---vufozunadowofenasot.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/pi7evf670kgamqfvm738fb7t0v/66610236642.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d960ae4d16---delako.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/48419529659.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/fikolebugunosibezaw.pdfIn PDF document text
    • https://nada70.org/userfiles/file/595921460.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf9586a179---60004270533.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/hj8rm9gdqntdiob4527rnf51a2/68441075667.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/809c44db39bce165c73bec3761466a5a/64645018653.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/jofow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=norton+anthology+of+american+literature+shorter+9th+edition+1865+to+presentPDF 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_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 11988 bytes
SHA-256: 2caa22d0d77315028af766647fefb590bafc96372e3720addeb546f702ca52d9
font_01_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 17088 bytes
SHA-256: 092bb9b4a5546abd3f0fec81e2e6a67fd6564ae4c9b84c67ccf66fbd3be10c00
font_02_sfnt_off000133d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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