Malicious PDF — malware analysis report

Static analysis result for SHA-256 3959427a58903411…

MALICIOUS

PDF

91.6 KB Created: 2021-07-10 08:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 83c59f87049a7017e18710a4569ba93d SHA-1: 9b835bb6cdb332015851628c8f4aea572c919473 SHA-256: 3959427a58903411250dd7da3c4f17c7cc148eb155af0e0d29046ef3e68df2e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs are likely used for phishing or to download further malicious payloads, as indicated by the ClamAV detection and ML classifier flagging.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://crysiq.ru/uplcv?utm_term=chapter+13+summary+catcher+in+the+rye PDF link annotation
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/35273480513.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/xanopowogefi.pdfIn PDF document text
    • https://ekransamara.ru/files/40652740568.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fjp5b71gav32v4snsdvbctub3d/33650312613.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/cad0d387d783afefb5f91ce8c5a6a9dc/82246264453.pdfIn PDF document text
    • http://jngf.cn/files/file/8070146883.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/kpilk1jikq0phud5dk3iub26ca/puvub.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160788e805f248---dedetokibojin.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/pafigigugisutekov.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/sosunelepipi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c85162d8c67---zusutodapal.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608990bbae6e2---99061423573.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3141ec0d9063650c94e640e5f341274a/xedenake.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/27538004525.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/xatiwamogoradepaf.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a65820e081c76147de7456a5c17b5983/61633711099.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1339e51566---67462785094.pdfIn PDF document text
    • https://agatanorek.com/files/file/16520257040.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/kewomejirabejotumom.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/gavupabeva.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/cdd39a9bd27b73250339282cab6b36eb/zapuvijikimufisinafodosej.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9035255b9f48005b083379d03f04d889/3384569810.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/5883e2fa9e84f6a288de7248a42251ee/xarokopumivesaxaluje.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/251416f2a4d86488208eac0c25ab427c/53441980441.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gugodixunumikaxoderuw.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_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 10944 bytes
SHA-256: c507a767f0fd45a3c107b22f8a3849be4236d405b2c8333e09e26a3eca84f4e4
font_02_sfnt_off000135ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EC 16556 bytes
SHA-256: 5a25025107983e557206f8ce708243912859e1f034aa0f5d05fc366b90ad2993

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