Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9433f67aa79086e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 13:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49c0883f6fdfc934ceee7a622800913a SHA-1: 98aabdc8ab854ac33460098a0df0940081f4d6b7 SHA-256: b9433f67aa79086ebfad021f2d5a89287d49e4149019e622fbf432d1575bc438
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript stream further supports the malicious intent, likely to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=cfa+level+3+book+2+pdf PDF link annotation
    • http://luxcottage.ru/stroykamen/userfiles/file/tobilugezorimajuv.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d5826d2b542---jupanopawamugetig.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9ee4b953bc0ff70ddfd702bd25955c56/damarotovemu.pdfIn PDF document text
    • http://888chji.com/userfiles/files/gudamexokas.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210516025644.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/fivibumoridogaxexunagulun.pdfIn PDF document text
    • http://www.moyekolodin.com/files/54893190835.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/mixajivejasatatulinato.pdfIn PDF document text
    • http://cocoal.com/uploads/file/24488624566.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0b9451098bf1519c3a8bccf6684d642b/5596403634.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/motutedesopiwanaliri.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075144d0f970---26132878926.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/budazagazogoxe.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/denusipugemi.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/50699542629.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/vifupavowizoditalofigifid.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9322be3391---69591955724.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/198fa75ab4783287e2627b027b1d1e7a/53667946880.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/23756218459.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/toforefujisenefevuwa.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/54213580395.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_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 10548 bytes
SHA-256: 273eb31eade22a7af860aaca8b5adcef9d55cddec5b36bea8be2221379a9913d
font_01_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 17544 bytes
SHA-256: 595483d9f75c83ca76d2e9242796b39aa84f93f62701e8d91253c8a1220af0c3
font_02_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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