Malicious PDF — malware analysis report

Static analysis result for SHA-256 7298539b66cd16ee…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 18:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 543867280d73de2dcdcaef49eefebe99 SHA-1: b7b7a3f61603363ee7b281124586ef39a24d5c6a SHA-256: 7298539b66cd16ee554787b109470106d0ed25d22386bc00473015e9863fe4af
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The PDF itself contains no readable content, indicating its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7795fdf84a---116622910.pdf In PDF document text
    • http://villa-margherita.biz/userfiles/files/35955651411.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a734cccae00---masiwinupi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430f75e689---84740221383.pdfIn PDF document text
    • https://riwg.in/userfiles/file/fewoj.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade3e8d4151---sitomapemadijidovol.pdfIn PDF document text
    • http://sakem.org/userfiles/files/vaxipatebotofogilije.pdfIn PDF document text
    • http://usdcp.jp/user_data/userfiles/files/49251729214.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/tumexuse.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/68620369987.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7d065e719690b77ce4ffe39306119bdd/lenubolasir.pdfIn PDF document text
    • https://samowar.ch/upload/file/xenexozof.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92827117827.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2af07473bbde81393f2b2d739c3c1cfa/sozurozi.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/tufotowuwibavuwejimuva.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/27595733222.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/90083133535.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/falelepubaxamonameweb.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/93228388744.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/59838154590.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//13317816282.pdfIn PDF document text
    • https://seikai.jp/free_images/files/18153995651.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112770050a12---kabufibivabimoketiwedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=asian+countries+currency+and+capital+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_off0000b995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB995 10808 bytes
SHA-256: 6d52df02c3bbd579106f25c34bf17dac448f604aeff490ec340c8fb86b5d2cc9
font_01_sfnt_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 16928 bytes
SHA-256: 9abdf6debcbffe1f4eadcee5a32245a1b9190b51546aae99ed0d0be53a63032d

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