Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a93defaa864d4cd…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 15:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86900344836fb964fc72b3585c722805 SHA-1: 081bd09729f7c73626cdca788ec9de979afdc430 SHA-256: 0a93defaa864d4cdc48f88e7d777791f4625300f50c416f0c7a8af35ca6658c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicates a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://retco.ge/ckfinder/userfiles/files/jawamoxedovijoxiwuzox.pdf
    • http://tostonet.cl/ckfinder/userfiles/files/9883555917.pdf
    • https://nusbetaja2.com/contents//files/43951172354.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1475246be9c9fe0e712b4807384a3578/22223253651.pdf
    • http://amandamaitland.com/images/file/23513043469.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a586c7912cf---30452263740.pdf
    • https://actaviaserica.org/board/file/files/jomis.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073077d91ea5---potiduwunisalap.pdf
    • http://lenosada.sk/editor_uploads/files/radekumaxakovop.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/dajemigobepesumasap.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5863cc055ba44edffe017f3f5d22279a/senatimipapasovatazunim.pdf
    • http://indagosrl.it/userfiles/files/depezusizunegoxorerivu.pdf
    • https://cdmsig.com/ckfinder/userfiles/files/30163684617.pdf
    • http://mdtrend.hu/files/file/roduxadanivi.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/fojarugol.pdf
    • http://faw-asia.com/image/upload/files/21771983447.pdf
    • https://marblobathware.ph/app/webroot/img/files/38818948500.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610391d8e8bb8---zedajorijilonorufate.pdf
    • https://fsreloading.com/userfiles/files/zujifopu.pdf
    • http://thenext.pk/userfiles/files/13557455833.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/xakadomiwevuboma.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468aee735e---tagegodotovuvidapajugowad.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/funirinilujopel.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6bb715271caaf1f8c3003ca0e767f260/18188526819.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a3440cd7421c02dc1d7b7532ba2106ce/mebokefefamolomavovulobu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+roguelike+card+games+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 16792 bytes
font_01_sfnt_off00010373.bin
52153b25c18bab7fb59ca65660a6fbde256bee13783c58b7b5017c7de31afea7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 17716 bytes
font_02_sfnt_off00013122.bin
77261e497237051150527ef50346acfa90ec972061454eb512c12405b1abeebe
pdf-font-stream PDF embedded font (sfnt) at offset 0x13122 10960 bytes