Malicious PDF — malware analysis report

Static analysis result for SHA-256 1895c7f639ae26cb…

MALICIOUS

PDF

72.4 KB Created: 2021-09-07 19:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 555455a491bf5bfa1e49cfb172a3c2a3 SHA-1: 62f0fe62176374b01ef780b0bffecc41bd46a973 SHA-256: 1895c7f639ae26cb1ab6676b38888f9feba195df0b7bba233b321e65e649801c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of external URIs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd18d9f2fd---xitofoveduririxupo.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d194870a3ed---xuvoxeso.pdfIn PDF document text
    • https://airbays.com/userfiles/file/pamatufevazugojipap.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803631e372c---96258547118.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16114905172207---dirovaxijabotugedonikosi.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/fruafi7mj7f40ghmluic4h3ubc/misidenapesufudo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/69994994159.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e1584d0d61f14ff3afe70f9e609dfe55/83314820804.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/pujemepedefakono.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/bagikegi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9b51d2599408d5147cfecfaf5f67eac6/22386692018.pdfIn PDF document text
    • https://superchills.com/userfiles/file/bebugiwim.pdfIn PDF document text
    • https://ntc-container.com/upload/files/sixivalix.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134b77db279f---zimewisuvug.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/jezijumitaxetur.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/d7e9girmrenaspkis9ut25h5bh/93327716603.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78617427820.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9458b29850c7177e9ee4a558ee411cf6/46320273924.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c99443fa3---47106072427.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/potejokaputo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1f81b22f5bcbf049b68766b9375cd491/45325132624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=problems+and+solutions+in+engineering+mechanics+pdf+free+downloadPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/girabelovavuluxijux.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_off0000b753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB753 16128 bytes
SHA-256: f6c6a823963705e2910c3bd16a5b8425a2f73394156fc33255f6f7a70fe08d37
font_01_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 11396 bytes
SHA-256: a88a7d90cbfc3fc5428e87a3e44ea38c0d77a5bc94b1c3d52e79b0ae6bfa29d7
font_02_sfnt_off0000fb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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