Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f766a0fc810184b…

MALICIOUS

PDF

92.4 KB Created: 2021-07-02 04:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bb6180ade5bfbb332dc052aa6836abc4 SHA-1: 2439f181a5e82ce3caf0925ad1c993164f9a6f81 SHA-256: 5f766a0fc810184b36b33ffb7d1c4973990370c731eab9a4da1f68677f66f9bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable domains, designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan distribution attempt. The document body is unreadable, but the heuristics and URLs confirm a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb4f4a1f7633c082f756194b234e9412/nabalamemeninipemenadax.pdf In PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc60811cad---dolofufenasagipux.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7f7264e1d42880fe6d8e1a2cc6809bf3/30039997286.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/3909631942.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/ruxivu.pdfIn PDF document text
    • http://cycling-software.com/files/file/9523947883.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/4g09hh9nd6ski6kkrael70s7h8/5116508488.pdfIn PDF document text
    • http://teplospectr.ru/images/files/56605948213.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/23497271629.pdfIn PDF document text
    • http://yuha.be/_files/file/kosud.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/12588000696.pdfIn PDF document text
    • https://serka.com/serka/upload/files/zuwiwiluxaxadinode.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/2014aa800d125d46b4d7199e55dfdcd4/88896192343.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/kezobepenurenevukesut.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e1678dc1c031a590fc814484db4b11a8/nevom.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/vejeribabegelefaxalusat.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/69181050588.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be82d9d91b---32665708407.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/59c444f58115aa37d5ac9edac5671f65/bibagalet.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4c114d97---45081699321.pdfIn PDF document text
    • https://nexusmediation.nl/files/goluviburupiwej.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f726a3dd69---66588772690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=right+triangle+with+30+and+60+degreesPDF 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_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 17976 bytes
SHA-256: ced13fd3dd641a47f84d876866eb958f700b8546f8b068ec334fd239c5b6fd16
font_02_sfnt_off0001498c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498C 11000 bytes
SHA-256: e8b2416279c06ead0c35e54ee91c7a8d0a05076f9ab3214683321a8e522e3407

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