Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ca4cbf49d3d476…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 03:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f89764b097a0a4a891dae3d44e07e1a SHA-1: 2b872981f687572d16fd0ba54d8957f0cd08075e SHA-256: 36ca4cbf49d3d476b2adf7f33dc1fadcab3b063cb859f709c855838c4c2b1136
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=the+certified+reliability+engineer+handbook+third+edition+pdf PDF link annotation
    • http://thedewakohchang.com/image/upload/File/387873571.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/46424785438.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/34076303316.pdfIn PDF document text
    • https://renetravel.ro/images/files/laxokuxez.pdfIn PDF document text
    • https://birudongker.com/contents//files/26316005804.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/timokadopuxemora.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/31198147384.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46051176132.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tixirokokezivuzemefizew.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5fd53176---59898689026.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/43358506818.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/boxopuloxu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6b318e45---mibesiveses.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e832eef48---58559309796.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/zovikar.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/69223510363.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a559e3bd243---xumotodejoxitivilet.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fe121ec6e---12805562699.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f8dbe77fa83eb4c47ac0cff666f2db55/tamewajabilorur.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/tawileruximawufode.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/kawopikozujasopamukimixu.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7bfd2b38c1fd0002f76a55a7d37c0265/50368919302.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/8571889014.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_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 11040 bytes
SHA-256: 7d38d1d9ed59b36c32492704f377b173d1b4eeb28e93d749851103e4e49d5002
font_01_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 17780 bytes
SHA-256: cb30b26e338507a3503ba4881ea743218a265521fa474e88b3d1045c234ef7f7
font_02_sfnt_off00011c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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