Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7af86809d1c5ca…

MALICIOUS

PDF

91.2 KB Created: 2021-06-26 21:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a098158c5b66c5fbabd93525c0c31216 SHA-1: eaa81dd2e3be6baee2ad1eac601b7154aeccd48b SHA-256: 4a7af86809d1c5ca7dae50f951bc7db225b68f9791adecc351daae9625baf4d8
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites and other potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://gloriouz.in/ckfinder/userfiles/files/63115211477.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0da909742---56216304983.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c4c436871b22afcd16102cdf3991d496/sobatorazegafexo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d012cfb5b82---69294452915.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/wokopejebozemepazabufuma.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/powarevo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce263b3a5d---45423422580.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/vodusetanoliwutusopamux.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/94038233626.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/sovakef.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/76343078989.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f015a91055---45100989928.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609760fbb3d8a---47493660952.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/rizavipunagowevu.pdfIn PDF document text
    • http://iltorg.ru/upload/file/95563259798.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/vidizaxefujupopo.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5149ad51653746cfe37d76a2c810113a/30644019273.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cc175e6dca24b6757a903cf1d3686afa/6081755905.pdfIn PDF document text
    • http://myredm.ru/uploads/file/90373700869.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a44ac725c---ramaxulegekonovifezofel.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/15f1f31d98b0607b4be9149ce44c835d/63933676094.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5da701b14---96051246532.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/92962544026.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/tt51f0aebborjrrv268k7in9g3/jorewopejawixuwivem.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/62a9951c3d6c35458d347291363725bf/kanutogimixedebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=high+school+sports+hall+of+famePDF 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_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B9 17536 bytes
SHA-256: e4722d3d94b089b48a8bd0d908591e94e53b3d7c40df8dba154d8b069d457c1c
font_02_sfnt_off00014667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14667 10812 bytes
SHA-256: 32e0648c8ddca4af97494c9d7a075a8c84418db309b4bc7b44cb6ba1557605aa