Malicious PDF — malware analysis report

Static analysis result for SHA-256 416f384d36d5660c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 12:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3580fb72f8e8a3fc7eb5fdff997d37b2 SHA-1: b592e16fcb0ab4a330ca1b10881263d07a548064 SHA-256: 416f384d36d5660ca34935d3cfa4b3fe3f680174745b7fed331a490d1f112e3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many hosted on what appear to be compromised or disposable domains, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://benly-carson.com/product/files/8122040308.pdf In PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/tugixad.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/26708490686.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/20855766303.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210826195058.pdfIn PDF document text
    • https://novitas.ro/files/54806393496.pdfIn PDF document text
    • http://aplus.to/userfiles/file/91837852322.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/51932611207.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f582660bb---tupiwodorazovorumezulu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/172cg21c97o6827qvfnor1odp7/rurusijudeja.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/purululasolilutala.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/66188437584.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/bokogewizidulivi.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/wewevup.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f7bdd090---nuwudokenab.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/65cb8467736b08871547d45926039069/76803813788.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/nomawafijaperojeril.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/30365154568.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/8925747834.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/rejopetikedimolig.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/7050264973.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/28456341730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=unhinged+movie+in+theatersPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a4cce7031c27b7c54c415cf8ff4d5b51/potid.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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 17940 bytes
SHA-256: 9dd947488a76f971adbd1a712eeb21b2f0b7334115b07e5e711e9631bd17acc0
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 10724 bytes
SHA-256: 7e2d88d8e90ab256f9846241556c919bbc84ced7612b3d976c9a06268471992f

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