Malicious PDF — malware analysis report

Static analysis result for SHA-256 737074de04232e13…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 01:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 979f36d487f5dd565e89e0b6fcad9626 SHA-1: 7b65e8dbc1d543c969178efaf91d53a3e6ebdc99 SHA-256: 737074de04232e13368f62fe2e0da22f4e1aa382d4c67219da2e16ec8a31f4a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Multiple heuristics indicate the presence of external URIs and a link farm pointing to compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=thomas+cook+annual+report+2017+pdf PDF link annotation
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5cdm8ohdb01p1nvdrlhg21vq11/riwetadefosuludilogo.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/98336628437.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30c93cebb---zaxuwagawotogedisudujow.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/17931432729.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/muzavuwup.pdfIn PDF document text
    • http://ippon.lv/uploads/File/zalovadatijarugizo.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/35233606232.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/62326195512.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/31868121518.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e280aa74c---bijubeboz.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/64387021922.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af89c6a1890---dazagoraridejuzob.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece53ea99a---vetav.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a081f3a17---13699989125.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/wemizutebebanal.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/58600961079.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7943370e45---tazipiniponuj.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/batutenowuvemexodajezaj.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/6398095962.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/928780bb6fb1121260ba9a2e458564a5/vulivajutinefunaf.pdfIn PDF document text
    • http://momsystem.ru/public/file/puzepenizer.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/lejepizuso.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/2906822056.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/kimen.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/n43ol6irudm52tleg1och3uvqt/matar.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_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 11292 bytes
SHA-256: 26b5e5cb80940d831311eb71f936fe33bc5e35c75fa3beb439b117a859ec457c
font_01_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 19012 bytes
SHA-256: e05ad3085e8a60d3ed72d107116d2aa9502fe222634563bc7ea5b3d4aefb1f04
font_02_sfnt_off00013785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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