Malicious PDF — malware analysis report

Static analysis result for SHA-256 52277b502fcbc1f0…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 22:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7bb27d85d90128aff22a5dba5672759 SHA-1: d6caa069bff5d4502644795c41ff707f1bf3c577 SHA-256: 52277b502fcbc1f0bdeb6048062bdb4e220440deef9454b52a9e4d912f960cad
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d47b15d2ada07fd0ca6155b7218e269c/kofilutitazozowojukil.pdf In PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/97236793574.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/vilolonupipunanokabomadep.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc92414c92---fagigobisajanuwi.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/63966300529.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/79006513911.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/67302399709.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/40738717843.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/a8no4rim3mpeai5o1a960tiil7/19142807121.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/dererat.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/vetopivuxumosuzobezuv.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/kiziwivafijubusigozuz.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/finisiramogesir.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/92374336274.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eef9ab4ff---2852587442.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/23410462660.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/14493595581.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/35656186608.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce58782337---87548117319.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5b0b675a---57283986352.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/belewozosigepinevokoxa.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dec7f172350---zogulepigutizete.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160788656eaf07---zulure.pdfIn PDF document text
    • http://northcity.rs/slike/files/xosabojexomonesox.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/4158671223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=themen+neu+2+kursbuch+pdf+free+downloadPDF 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_off0000c983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC983 19664 bytes
SHA-256: eafb79ca19ac8a0bf07097e8556ef00a6e3a96f04ad26828a83a8c0fd28d6536
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 11196 bytes
SHA-256: 07c7ac4c8bab6b65c03161847d52ba4b567c8e37bc89cf8829ecadd9cf27390d
font_02_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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