Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b753e2a2feb1846…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 17:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c3346bb60cafc4daa599118bf245cc1 SHA-1: f15f86fed387a49a846ced02db19c6e9b3c83523 SHA-256: 4b753e2a2feb1846c462d95cb66e55ebf5b85e28a26c7bc1032df3f0d8c0ae4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs pointing to various websites. Several of these URLs are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or conduct phishing attacks. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=similarities+and+differences+between+transcription+and+translation PDF link annotation
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161219fc2676ac---nifowakax.pdfIn PDF document text
    • https://orrizon.ru/images/file/runefukolete.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/21754413033.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/65018496534.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e3480fa1d---37699062356.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/waposoxawizelad.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e7ad41d19---rofan.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/6bc04361c2f16ab4c9a77c9917171f3a/tosukibopaden.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/xizaresuf.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/livebotef.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c0341a399ec5a0f96651647ed69ea93d/woxererizuxafagaxajaze.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/nofut.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6bfb01fcd60eb90bab23df4a80d08fd1/22751660027.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/xolapulafu.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/66388859200.pdfIn PDF document text
    • https://novitas.ro/files/2266355043.pdfIn PDF document text
    • http://dzbnf.com/upload/file///fibofadokotitogodoxes.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/4e74jlpp6daro2hugru3qs4qup/48806128473.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0a9630c64---4402826444.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/30299968582.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607526f3ae68a---68407288452.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f7b9e2ca77c1d091b6a4df8f365420b4/81446522607.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_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 18352 bytes
SHA-256: fbb4d5329ec6f7dc0d6c7395abd01e8d8f0354de1fa0a58a14b96732365ba2fb
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 11080 bytes
SHA-256: ff228fe2c44995bf842fc173e14646c09af6b5e96ccc62e49e82af852880f809

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