Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c4f0f4dfee9994…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 10:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c7f297a4c421dea69c09734c28c57ef SHA-1: 125cb2f2d740577a5b8dc9402557bb789ef2d33c SHA-256: e1c4f0f4dfee99947025982a5a330791eb9b721bc284d0bf1faf465e3c9b4ff4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

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://krisoc.ru/uplcv?utm_term=free+screen+recorder+no+root+apk PDF link annotation
    • https://windsbs.biz/files/file/38114718600.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/zorekidapuwebaxidoredivus.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/pufopubirivodujadomuvati.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/27227423585.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5a0f22ffb4d7d565332805a3550dcb45/15760948371.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ff5730da2bd398c1f2f2b6a6f109a8bd/77554227223.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/33353441363.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/furasezox.pdfIn PDF document text
    • https://cargotavio.ru/files/file/faroki.pdfIn PDF document text
    • https://europartner2.pl/uploads/68727570906.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/16264101243.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16145a8a32d517---vokuwuniwedalimo.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/wedarepidabuzosizadinito.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/90678114807.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/zober.pdfIn PDF document text
    • http://agmapure.com/upload/files/65157084119.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/kanodenowatapimegu.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/wisotogumokilewovuxibe.pdfIn PDF document text
    • http://cf2sc.cn/userfiles/file/vamipozugogegipoputofew.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/81951666933.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/relidar.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8749da89---dapizinunitejapipapovamo.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109100116138405.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_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 18232 bytes
SHA-256: 7e3b91b40c1ca0609a2955d54b5eb19817760d0adc046b77ddd658a69f0ece0a
font_02_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 10440 bytes
SHA-256: 4630d85b6fd207c95e12acb2eb5d9cc16eeaca43cc88c4c5fdf20c8165d4520f

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