Malicious PDF — malware analysis report

Static analysis result for SHA-256 39591fb96f2ee8b4…

MALICIOUS

PDF

91.3 KB Created: 2021-08-13 16:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b5ed6fd6f5dc4ff463c27a7a6782fe6 SHA-1: c7e7601c1c9fc4a04652bbb275431afefe525c22 SHA-256: 39591fb96f2ee8b4011f9aaba32426a4fa67fe23ee483751b2cd843a5c2f973b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were extracted, the presence of numerous external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://carlojans.com/cms/file/57480713003.pdf
    • http://wanyuantemple.tw/userfiles/file/1992587716.pdf
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bonigobigorafidufoge.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085273bbd4e5---wunekasakisatonexapajazel.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4bea7bc6f---77142124690.pdf
    • https://vresponse.net/userfiles/file/13162012848.pdf
    • http://atomiccm.com/userfiles/files/panejokikitabaxoni.pdf
    • https://falconshipping-uae.com/userfiles/files/pawijoterurikefedatolufob.pdf
    • http://fujavietnam.com/images/Download/97971580878.pdf
    • http://inercial.es/uploads/files/62303656475.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ghcgrubobpvcdfs65ur4gquenc/midumunijebigotegatuwog.pdf
    • https://hometeamcorp.com/images/usr/najexilajiromuriganug.pdf
    • http://nuocmambason.com/upload/fckimagesfile/5ed4a383e74640304592a3aa8d973d0c.pdf
    • http://vizit-k.net/uploads/editor/files/63374215638.pdf
    • https://amblamy.ee/upload/file/sowobutobupidapukuw.pdf
    • http://stalmost.pl/userfiles/file/numonitibofepepure.pdf
    • http://bigxra.com/uploadfile/file/2021051508254573499.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/tokosogizepebokilofi.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/95ca2d756989b4790fb835880e958a70/56568714847.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/18988837455.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba31d991dd6---89282269607.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c35435d08ea---lugibevowigujonezawewejen.pdf
    • http://sushiosushi.com/uploads/files/roluvazibakupem.pdf
    • http://aarogyamedico.com/userfiles/file/xopover.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=asphalt+9+cheat+engine
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ea.bin
79a14ba11d0dc0736ddf5902aabb2c794848e6db507d251edaf78943901e17d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 22128 bytes
font_01_sfnt_off00011967.bin
5088126071a7f5ad034ed8dabe92b5533f80c7b9a0a410a3d14edc45955d20ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x11967 10580 bytes
font_02_sfnt_off0001318b.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 16144 bytes
font_03_sfnt_off0001470a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1470A 16792 bytes