Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7f164029ee879d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-02 06:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 680be3ed8413ce7a0d54421ac96b8452 SHA-1: c5ed9966480e2e4ea4da722a1dc409e060b0081d SHA-256: 2d7f164029ee879d337bb43c656ab7eea59322bb6e42a3c21c21b8bd69d2459f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites and potentially disposable hosting, suggesting a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://machnik.net/ckfinder/userfiles/files/mofuwufumozevulis.pdf In PDF document text
    • https://pointvirgule.ca/upload/editor/file/37869289845.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/jijekepibev.pdfIn PDF document text
    • http://myphamasia.net/upload/files/busenenalejatadizotado.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/beladinevubewusufatuperu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee39e5b6eb0---lexow.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/16417939086.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/wizalikozakebili.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/53535598358.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/vubirunigef.pdfIn PDF document text
    • http://spiregene.com/image/files/20210714_002654.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/fodozubekupikij.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c9bb32c4e---bewuludizuredeputenaz.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/erbuj9fuko2sjdr1vv4a54mm2d/wivawavolapukigavimosagag.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b12e165b2---fezegixopoxebizititudidi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc52aeb51---65120519037.pdfIn PDF document text
    • http://geotersrl.it/file/sefofagesopupobaf.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/buzine.pdfIn PDF document text
    • https://botroul.be/uploads/64131620858.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/72383790422.pdfIn PDF document text
    • http://bronia.org/userfiles/file/xavaduvesudubu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d89226747---57754796531.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/70033579216.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/tg5i8p0orrnmttkkdq8gr6aefa/lonut.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/ninilemofosapawiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tory+lanez+the+new+toronto+3+downloadPDF 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_off0000bd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0A 10480 bytes
SHA-256: 47a0d87f0918f2f825e9d5a2a29fe7e79886157ba2d7dcc8082993dc3348f8e4
font_01_sfnt_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 15828 bytes
SHA-256: b1df76eb2043c6cb205470cbfe71a1294fde1d3fd57210fb8483ad7278a8c620
font_02_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1