Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd171994a0451e72…

MALICIOUS

PDF

90.1 KB Created: 2021-07-05 01:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0d1e1c795f8bb7d49aa6e54a459271d SHA-1: 44b5e1d0981cc0b862a9165128e5ad48d292b678 SHA-256: bd171994a0451e722beeb774c20b8bf96fa53821981ea3a82ce407982984fdf5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://sun-green.be/ckfinder/userfiles/files/56850053903.pdf
    • https://fivetc.vn/uploads/files/topewiposaz.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6daea121f8---51462061289.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa2b87ae6d---22580073021.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb6fba5fed---kilixaxejexuzazikape.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d5caef7bb---talulemizaj.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160de38445a23a---lajuvegekipozovuwosane.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16200789834363.pdf
    • http://jullien38.com/ressource/site-image/files/lulavoxobigupaf.pdf
    • https://avgdesign.com/userfiles/file/tufib.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/pujulijoxizibifakepodi.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/musexetin.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/06ae76b23f50665270cc293c1634a154/80516000724.pdf
    • http://www.ecvbrass.ch/user/web/file/kunidukojufomob.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd91699975---pojinolo.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3c5c1506---26919021753.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cq3h6189hock6vg0hfa436op01/63579414055.pdf
    • http://atek-ent.com/upload/file/topejuzidi.pdf
    • http://akkoryazilim.com/userfiles/file/55192410802.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609841e9e20df---93731449818.pdf
    • http://simonide.org/userfiles/file/31578636048.pdf
    • http://paillasse.hu/userfiles/file/79549554292.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094dca09b949---67370546204.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/20009d18f97bd6522be4ff0376c0b4ea/87795846630.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cell+cycle+microtubules
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
font_01_sfnt_off000115b4.bin
aa0b70b4369bc179bfa46ea123b9b433bd8922fe7038675a73403d1742fb0f85
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 10508 bytes
font_02_sfnt_off00012dac.bin
dfa21e40533d8b1cc34bf60a10c7b18cfda12135afaeb9c020037af0eebdd002
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAC 17592 bytes