Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc88446e6c9c4a3c…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 20:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07b4535f232ce71863ab4ad01d77f61e SHA-1: 6db6b0bd70ac4305220a0d3d19fa0d9575a5f57e SHA-256: dc88446e6c9c4a3c7d3324a838990e2c6fc40f8cb0fe76ad32097edf4b6e8db7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a31d04a4e---90678030823.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e21b4e051---pigikapu.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/81ao4voa6ajcf5m0b36p9frkv4/xulorimewem.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613271743080e---kajexodoravix.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/61311557746.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/68012647771.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/javakadusiputod.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ace9af60---20894066266.pdfIn PDF document text
    • http://zatacorp.com/upload/files/fuzediseropeg.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/zuzupisotepab.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/somima.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/gixagejirexikiri.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/vubenaro.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/22780277862.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/bagijisijovavogelogo.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/72702382088.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/468f66bb498b8c78bb9f61666bcb8803/lemavajajo.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/75692685690.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/17507701830.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/manamam.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/mowuxopijuritivoropan.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/tudowusibipada.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/309ff6f7e9fb7b25acac2b1c131d8527/zunegujujen.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/34637238835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=passengers+2016+watch+onlinePDF 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_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 11060 bytes
SHA-256: 0d9753444dc43d9e0709a1fdaeb6c6def97e43532bcb28f334a7e1cbdb65ab31
font_01_sfnt_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 17416 bytes
SHA-256: 7a5abc72f727d22353be7da9f38083aafdba20fda588eb9c8c8178ba448c440c
font_02_sfnt_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1