Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c60693466c8d45e…

MALICIOUS

PDF

90.0 KB Created: 2021-09-07 15:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a9242917d0e4edf41636710c7832106 SHA-1: 0dc2071791c3af2558a8bbe17f88d18a6653b92b SHA-256: 3c60693466c8d45e86bd1ff628d116481edbecb04562241f3aa720a035782626
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or SEO poisoning attack. The presence of external URIs and link farms strongly suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/89805544931.pdf In PDF document text
    • https://sealskinz.ru/files/file/93477654135.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/laluwowarusegewi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/560773c76666eef5452f8291b00e066d/zamixewowo.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/50251506938.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/23974098015.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d78b60fd8---namazoxapazimenokokarudod.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf8f6633f---72525267671.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/51cd335546d7360c5d2007c794fcd0ef/lobig.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab78c5cbca---42341686497.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609474f119e15---59484015007.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/mumop.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab68d75701---30461906934.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/lurexatusavapewuzipitig.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/56289729329.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/2382946569.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buvajonakanil.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/85551938962.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///22772815688.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607164dfa1f89---19151853910.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/64550573237.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081a65e36245---38778665709.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/tidez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=belajar+microsoft+excel+2016+lengkap+pdfPDF 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_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 17860 bytes
SHA-256: 9eb869a4e367b47ef207687db14e544eaa245fe37dfeb57a7c30cc400ac914f4
font_01_sfnt_off000125c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD7 11800 bytes
SHA-256: 963db491314f9a780e2e5144cd0cf21604d58210a35068c6ff0573312b0753c2

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