Malicious PDF — malware analysis report

Static analysis result for SHA-256 b380e548d4d56f76…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 16:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc57ffee9b212ada740332c9605c9801 SHA-1: 969d5caa4351f2d8c7da9d01a47962fb4cbf4d9a SHA-256: b380e548d4d56f76c9caccdf638a68c31065bd869a71d17486a3c3447a70a592
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external links, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://algarestofos.pnh.pt/js/ckfinder/userfiles/files/wukifopideziker.pdf
    • https://idroilektriki.gr/files/file/bitazekopi.pdf
    • https://netron.pt/app/webroot/media/files/vuvobonozewulomel.pdf
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/34300593059.pdf
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/tufageba.pdf
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/4616025806.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614f077309a40---32732801715.pdf
    • http://chizclean.ru/files/fck/file/tovaratokomizus.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614218c9962d8---sabalunirosazet.pdf
    • http://gazetavk.ru/img/file/71331281121.pdf
    • http://hrudolf.com/userfiles/51990669932.pdf
    • http://hilimall.ae/uploads/files/33164686879.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/63047764305.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613424a506348---dikifoxanenenatonopopulu.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b55deb7b---pukogiwojowolew.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/712e2187a49a81c2a625b11e62f6d87d/1254867208.pdf
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/94357473294.pdf
    • https://kolbandibileklik.com/resimler/files/kexev.pdf
    • https://7mark3t2-7aya.com/contents/files/41780219109.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3c6e62705---65258471288.pdf
    • http://sicilalluminio.it/userfiles/files/96521510695.pdf
    • http://immodraft.de/images/architekten_agentur_images_/file/nikefawuwebikufifarigok.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16143fd1827a00---zulivik.pdf
    • http://dpsnowodworze.pl/userfiles/file/35283373062.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hello+neighbor+mod+menu+apk
    • 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_off0000b2c0.bin
8abc8a1cbbd8673717f723590b862ddd34b213ab68b25af49d3d0ed82e50b1d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C0 18208 bytes
font_01_sfnt_off0000e1de.bin
ab08f0b10d0fc19301b32eea293e1d793ed91a1d685e0e48bda54482384bff93
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 10896 bytes
font_02_sfnt_off0000fa50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 16792 bytes