Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd365464f81d8e3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 22:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c3e6a311559e3605b8be03a1a28cd99 SHA-1: 9519ecbf3adcd60fdc3b449b5d4d34c171a595da SHA-256: 5fd365464f81d8e386c3945a0f216b59d6c4a00a4339a1cdf22daaa61ec33815
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external websites, with several links pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to potentially malicious external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sardavetri.it/userfiles/file/80603724491.pdf In PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/zazewakafuterud.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7b397b5e---68974500765.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/5tmaupqtv053iorerjq7boslcg/zitejutewesatig.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/78144641124.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/dijafuvefinifilab.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/fofujagusonasutum.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/44028257502.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/42918497736.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420d5304e1b---23383861837.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8489199d---47142706985.pdfIn PDF document text
    • https://clubon.top/uploads/files/36671754203.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/xesexojunasulukifikazad.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/levik.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dqvvkgh8j51lkr5smje161m933/manudusofowijiloz.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/75308573127.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/mmf0gc91mgggh9sb23rmh6bqqi/pujatesumab.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/20603291438.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/valelulepafemi.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/78943526152.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e25fe5bffe---5418275387.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/wididekamoxus.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/wanenoniwewinudosedobolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=full+body+workout+muscle+and+strengthPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/86618760788.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_off0000d319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 11232 bytes
SHA-256: 06a1f9d84dc03151a4dfeb7168f8a90dd95071737dacd2a23ebb30add4cb36ab
font_01_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 17180 bytes
SHA-256: 6d3f57c746a7a19ce9fbddcc1f039edb334b0c0b9c3f84ed57764b881034acea

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