Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d9164b94a19bca…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 03:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0aa521c9742b39586c28a527fb300073 SHA-1: 053a0ccc7949abdfb7ffc0f7e8a6324ca611b4dd SHA-256: a0d9164b94a19bca9404406b08e7fc0adcdee5a222d28dd772a7c2ea34a12040
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Several heuristics indicate the presence of link farms pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e291f32be9---gevewuxirate.pdf In PDF document text
    • http://tonghuichem.com/upload/files/xomutonegegipiguwir.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/jpot7bd2ft2or2cie0ui7sn6mf/64553907991.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/85057881710.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/1874400701.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/jugigevu.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/suvokofaloritesetosozefox.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/fegitexowurod.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/vudojirapexubagemopelusip.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/joxuverasugomaj.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/zebaliduzurizoditikiwo.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/1013858372.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/bejamar.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/tisujuluwawe.pdfIn PDF document text
    • http://z500.si/files/43986695707.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/7259131168.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/33922984455.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/juxesanugo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/45a1b3e6826aa5e10f6eebd4e706d8d3/govedovulupupupo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fea8d8d1e---demomimusafojimizetofojo.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/doxupixelibudokeji.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/40786935590.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb3a5655b---12277736273.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/92566679866.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/limenijobimakin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=syncing+apps+between+android+devicesPDF link annotation
    • 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://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_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 11124 bytes
SHA-256: 366414d23e1868d58bbfb6169865070593920e21639016cbab0957f8305ede71
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 18208 bytes
SHA-256: fafa6b77fa46cedc5c5134d7a66aae5c0ce0175b5c967fb9100df1bdcc690873
font_02_sfnt_off00012897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1