Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d5f89acf59f2e6…

MALICIOUS

PDF

86.6 KB Created: 2021-07-13 21:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 606309bcecf0149b54533039982f75d9 SHA-1: aa3f2b5c62e2ea1c4ce3f4cdee3beeb45588392d SHA-256: c8d5f89acf59f2e6d4c5f4959b203abc05d1dde7ea2f9fc457182dc9429e65d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised WordPress sites, suggesting a link farm designed to lure victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.valathors.com/ckfinder/userfiles/files/4116095425.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4df6f38f8cf1b35a4d3d817d28896b4f/41770072026.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ibbeh4eftpis54130bi0bj4qjo/siwomijomimifozudipo.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/jupademijanes.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160acd95292838---49053222822.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/lujiwapabosijonufi.pdfIn PDF document text
    • http://sport-way.ru/img/file/31824176232.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/nssuf3auvcju5riima8vin3nr1/zinisudakalub.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dd4063a98e03bfafcf494aa324c1f16c/vigixabaxowoguju.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b573519cdf0---tesejo.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/vokujiwonizavejedali.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aceb15d66ce---zavefudawopunex.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/61205165112.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/nurenekagigumeb.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6e8611c23a0ce8778a3cad8dd56890a8/36545735274.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c886a411cc---14771971798.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/vivepuxalarikobowalujepan.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/rigubimomejegezidasepikag.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788705177c6---madukeme.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/fejarozuretumifose.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/59064742743.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/sumaxisudagevinut.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd094a359f---pivatadukerulugufaj.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/wurikuputimonezu.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/zupavifakikurelazon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=celsius+to+kelvin+chartPDF 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_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 10616 bytes
SHA-256: d8f0436f4af5be3c5e7da8a9b60186fccd6ccab249e17b88be6e9646db53c8ab
font_01_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 17952 bytes
SHA-256: 47bf1ebfcfcec8036f677e5350c70afcdaa088f8bcebd91c923c828287c8b17b

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