Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe904de046045e6…

MALICIOUS

PDF

96.9 KB Created: 2021-09-18 15:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 094c0730d0190d3dd049d2fc37e59a53 SHA-1: 446a6806ac4b2862ec56a52881d189ab4b2182e2 SHA-256: bfe904de046045e63c999ed27f34615755210cad02ff1fbd0f75e59c1c9e1519
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=vector+and+tensor+analysis+by+schaum+series+pdf PDF link annotation
    • http://195exim.com/datas/files/19999498930.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/rujimixumavigifoku.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/bb73adf2c201e481b1fa51b6321b7de3/pitibexexobanotazagewiv.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/netuwug.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e9135cfda---53735757957.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d45ec84305e99cbf572abdff61a3b08b/muxerukedijuware.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/35564083066.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b265ac1e5788b55850415a302161d02d/fixijanunujepewo.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210909190449.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413dc26f88d---19755230021.pdfIn PDF document text
    • https://webmenuplus.com/images/file/72860515307.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219111116556444.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/10590673971.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210916210925.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/585612776.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/kosub.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/25003922422.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/giduvojokimodujegorevo.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/wetiwagowavozovufe.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/40860660741.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/23988631149.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/memipoluwikut.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210913184749.pdfIn PDF document text
    • 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_off00011671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 11208 bytes
SHA-256: e9437a84959cc2db70bdbef802d3c0b6db1fd6b9afeaefac1f32bea295f0f5e0
font_01_sfnt_off00013049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001485b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485B 17332 bytes
SHA-256: 0fcfc056bbe03bf08f1d7ddfb1c51a20fe1c9cacdf30cc26d012c696e0457e9b

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