Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f6817ae3de29c4…

MALICIOUS

PDF

85.2 KB Created: 2021-07-03 15:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce2bc510f2aa9b2a3ee209ba7704b5e5 SHA-1: 8b0e14c46c03aa345e4ceae8470355273b2392b4 SHA-256: 50f6817ae3de29c40c2c70bc289ff7e3d3d565b32e8fb6e90c12718c8635c920
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially malicious sites. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=sloven+to+english
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11864dae1---pagulosuzabevesa.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de14bd66e70---moxagelilixalidudur.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/35546382528.pdf
    • http://arci-mp.fr/admin/File/40885307504.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e69d5b149f5e7dd2909e408dca7cc63/warole.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb12170a07---mumoduv.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc89cd13ba.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef63d500b8---raselasarunorosazenuxe.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d915d4421c6320357923999e3b0ed65/rulipim.pdf
    • https://bravo-hk.com/userfiles/file/60135848846.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc290e6ec9---11490242269.pdf
    • http://kap-group.com/ckfinder/userfiles/files/27936440891.pdf
    • https://alistairmills.com/ckfinder/userfiles/files/75979180813.pdf
    • http://j1medical.com/uploaded/file/270389038.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/24772597542.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a209861b759---xuxifoxafiwobi.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da9677a96f6---65081663179.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ca281ef4a982d1b4d782e50cb5b12318/46779718753.pdf
    • https://eyetracking.pl/userfiles/file/xobaged.pdf
    • http://inwallendorf.de/userfiles/file/86621222566.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cd8fdaf31---lepawubevumamuvilajisok.pdf
    • https://ndmoyun.com/calisma2/files/uploads/67446061233.pdf
    • 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_off0000ece0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 16792 bytes
font_01_sfnt_off000104f7.bin
dc838a0c5e3ec41eee19f0c8841c477052d800d4154db28e4e3d8136a35b135a
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 10264 bytes
font_02_sfnt_off00011bfd.bin
a6e4c412a31a2b06a4f959cad059be889a9c114d51232ec7e624038f6eb46551
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 16892 bytes