Malicious PDF — malware analysis report

Static analysis result for SHA-256 669116b6cf7fe6a3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 02:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e069c330659749cc138b60444d3cc20f SHA-1: 29d560ca9bd8b285e33ee41a786e400bb9279f24 SHA-256: 669116b6cf7fe6a3a42fa067fb65821cbae5ba349b591b317f79b6a1a2869165
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://cructi.ru/uplcv?utm_term=linking+android+to+pc PDF link annotation
    • http://cisseo.net/userfiles/files/51460756630.pdfIn PDF document text
    • http://aedwea.com/upload/foto/50679637030.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/35139578780.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/85573227353.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613765d810cca---55439073388.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/mefenefadusifakesixep.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/54469224993.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/80283713207.pdfIn PDF document text
    • http://yuli-china.ru/d/files/13777787403.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/32138938510.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/dosederowomebufazobade.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/fosarab.pdfIn PDF document text
    • http://119pump.net/d/files/15940540920.pdfIn PDF document text
    • http://airzo.net/userData/board/file/84744485157.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/wisepinelulaguk.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vusabifemexamijixaxare.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/36062469680.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/l3bgu2fdqfth9813nes10f2pgn/lolavedafenawaxidi.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/manipudadofurukaguvigeb.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/fc32adb552b24bf17a18a04beaa5a02f/ditomokaregedozixebedo.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/53196918415.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/75866136165.pdfIn PDF document text
    • http://grupophi.es/uploads/files/kajasek.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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 10392 bytes
SHA-256: 6aae3a419b829bf9a8d7ac374a48fd9c1707bfffb9fde857c52668af93d6cd1c
font_01_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 17872 bytes
SHA-256: 1c1bfa03ac12b2a8f1a7b2eb9149402f954abfa7a38560ac44bbd8f433e5f5c1
font_02_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1