Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b806640a67ffe46…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 23:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 28d174f97fcbe2884c7c1e49ef492065 SHA-1: 16f9e99cd6460f5896a4cca5f89ca006073cc1bd SHA-256: 8b806640a67ffe460205ac1c347d74d3c413a359a5ff44cafc7d0a1040e06298
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates a likely attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=maths+11th+book+pdf PDF link annotation
    • http://edmo-cars.nl/images/file/zobujekagaruda.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422e3d8b39---44095579820.pdfIn PDF document text
    • http://epplast.com/files/file/26970889134.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zunodisuzipumapakugesu.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/7406682405.pdfIn PDF document text
    • http://jiab.net/userData/board/file/newijegizaxogu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1cbc286f5---9842256982.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614029bf532a2---dinonesetodigevoror.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/45c6c9d3feef37172c4bb2dae754c203/xatifomu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161329e124eaf0---41743772156.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/18635368278.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/kubarewuniwopanati.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f6421d88---47533366874.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/renudafuwagiror.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/73400439652.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/70497440712.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/49d33d21d2f8ce6dc868e55a916f7627/lawasolivilonazapo.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/50087365380.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210905_171234.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/bizobejupaxevozug.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/22793643563.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/gaxixoleg.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/zuvonubono.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/kuleziwijekujakapemisorod.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/36169902250.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_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 10400 bytes
SHA-256: d3a6e692bfabb39db471344fbfaadb31777df1affcf367df7f9e0eb776676e53
font_01_sfnt_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 18420 bytes
SHA-256: e11b013e52b731371a295be6f6b31d49a69b4c718987b47a983bf0159486e245
font_02_sfnt_off00012536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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