Malicious PDF — malware analysis report

Static analysis result for SHA-256 6223b2e4f169933d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 10:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 954a1b28ce90e4b47c8921b7a397b000 SHA-1: 4530d5d7b94ff494497bb7ed66469fdc010186b9 SHA-256: 6223b2e4f169933d4b9cffab6c8f9f23f62edb9c3a79caa29f35b493a00447c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, hosting numerous URLs that point to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farm characteristics indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ambvetsanprospero.eu/userfiles/files/sepuj.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/92d46b9d26a9ac61099ba297696237e4/38352762459.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/43075961086.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/29345d9165ef2744f9d444e77a6039b6/bizowifez.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/932ed7928a51f259953270f14569c1d3/bubekofixup.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/favobalexowufozonimegelo.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7ac670e66de973c4246537a472aa1b7f/72472117084.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b090616550---47694184499.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a922d7999---tizezo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca08af62a---fimobe.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/91785165988.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/tafifejazewo.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/jevaxesoraxuvuluzupon.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/lotibekizegonimi.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/rananewowovogi.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/96102698189.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/33407018039.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/vorifowifeduluw.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/97739185401.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fd17e6a4491---3571384931.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/piguwolamopaj.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021882019589918.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/13201976743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=psychology+interview+questions+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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 11252 bytes
SHA-256: 41623442a8258eeb62b08be21479a3198c21d6a31f873605ec572f827d2b4e1f
font_01_sfnt_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 18040 bytes
SHA-256: c50f726436eb8a50a0c368b37592c4c8980fcc9f24fa073b1f3157dc552fc7b9
font_02_sfnt_off00012cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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