Malicious PDF — malware analysis report

Static analysis result for SHA-256 a124a4b6609f198b…

MALICIOUS

PDF

126.6 KB Created: 2021-08-08 03:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3e5298889601359d9cebfcd1fc4688b4 SHA-1: c422e6f6b9b8327fe27b901fa4da4e2fd3a71c9a SHA-256: a124a4b6609f198beb9b3c4ea00616929750a4cc6bdd0e00e55225246aa7eac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing form builder plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to obscure the ultimate destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2b6687448---15112409535.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607d24c7e8dbd---lebipibimabuletevozin.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f82bdbcd20d---xiriworuwafazepafu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/chrvdmrglhqsdijqe0vhj8neq4/85550531294.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/15133805345.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de49204570f---dexud.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160882a8f82ab4---62337409308.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/paniloruwalevuvo.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/jekofimuxuv.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/tusanojepolabej.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/97426625583.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/nujupexo.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3cd2edd1cf8ac6d729199b8781716970/ralukevimupova.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/mepawumosebemasanade.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/976f85dcdd961a638e9ed52bf16a6c00/97283833312.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732517db710---545807300.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/kojexolexukivir.pdfIn PDF document text
    • https://digireg.at/upload/bejubujuwusewikuxonopek.pdfIn PDF document text
    • http://pasted-radio.de/web/files/73135876763.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9c5ecae7d---wewedoxogorawojowupe.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/14770404368.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/21365615971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=challenges+facing+the+teaching+of+religious+education+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A97 22208 bytes
SHA-256: 2cf41ba4bfe6044173d6424e6621203a03f1515e5579e61b244164ee58400b07
font_01_sfnt_off00018288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A9F 11028 bytes
SHA-256: 498913f41a1d1c17ffe4f70f43b15461a79ef4130518980ce99d880bca0305f6
font_03_sfnt_off0001b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B400 5756 bytes
SHA-256: d1a64a365048cbf864187b86214dd01a919e41469d09f5a4711de211705bd5ef
font_04_sfnt_off0001c8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8B2 20044 bytes
SHA-256: 436fce1707fd1954d0dfcceef2143d37a00e52f2128df9073aa83dbe9fc08eab

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