Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3e57d5f6a18b23…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 08:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0ebc616b69d24278a428dce661935be5 SHA-1: b36f37cb54249b28463fc83c6fa116b176ebc2f9 SHA-256: 4f3e57d5f6a18b237d97d27f3ef4c8fc336dcbfbdbc919b68d43dd15de571bee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=what+colour+makes+blue+and+green PDF link annotation
    • http://quocteanviet.com/img-chamthi/files/82450907605.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/41472391072.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/66b67049d66ef14f5fec8951e4ce53f1/ginel.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/kafekekituxegen.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077382653fdd---vekunopoxakalotaromamaxu.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/jekipugasopewozajovedep.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215121328581954.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/wusifedakixevugafevuve.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/dasuwolaxifolufujimejubep.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/rugaraxuruge.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/54320851700.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/229286df7d73f47902637dfc30af6408/lusatomojadudiba.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d7873526a---rakarojirukagopopobi.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/18762356436.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c9d045c0a552b6c4529cbd1f0c515bb8/9349413905.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609510780c036---fitiribidopawaxet.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/lobaxutipadibuwu.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/63371839179.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/vadegapivifunazotoparal.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/76e7bb6bcd716f524b8f36add64f15ba/vitubisogosegil.pdfIn PDF document text
    • https://sadex.pl/fck/file/30618922990.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/6751885643.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/17350387038.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/jugidulijefegufe.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_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 16784 bytes
SHA-256: 02110e977978313cec78ba8a1d941950b5956a3840d6e59d8381f38c76dae0aa
font_01_sfnt_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001277b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277B 11048 bytes
SHA-256: aa84629e5876b2d0ef6031c5007347756b5ac1da1161a2ac76fe41cea0555342

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