Malicious PDF — malware analysis report

Static analysis result for SHA-256 672335d57f30c69a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 10:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75d74affe21953ad7bfc09e413e7eb17 SHA-1: 4bb32faa820c3b2b95ee1ed2ac2c7872e9ec6a56 SHA-256: 672335d57f30c69a1d1915dda4f6a35a07e320f807a4f321e71d6b99a1a86d85
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://toananhmedical.com/uploads/files/20908219035.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608892f9cf515---20195016549.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/70442482425.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/fokasulosezaxu.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/97648326407.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/21533475280.pdfIn PDF document text
    • http://teraval.cz/res/file/puzuvix.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/53398166148.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/xuviwogazanikusigibigos.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/44b65d8f3d895afd1eb6525fbb6aa5c1/xunimuw.pdfIn PDF document text
    • https://kildevangen.dk/files/71578864935.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/darobuwi.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/64626356526.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5ta3iq3fjs26e4sqo8b7b7un2i/pedupaxuwetuzofafeza.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f084b7c5f0---30942476136.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98a38a24c2---rejabuwalaveb.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/97830159894.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c6420c9e---tazivimoru.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/bd1409a1d10df0bde08ad32c22a7a16e/zuneredifokuz.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/4e7be87ee8c5be8e2dcc9fcfcc825b08/rapipib.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/mufokubuporopop.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8f7ed72d9---faduxupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gas+stoichiometry+problems+worksheet+pdfPDF link annotation
    • 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_off0000c0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 16748 bytes
SHA-256: ee6b58992f6b7cc13cb125f9e4de83b82843936e55ce8805b600a52a0851ff83
font_02_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 11252 bytes
SHA-256: a71a332b48f3d03a4c366ab10433675c014df9a881b3265b8135e71058d08fda

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