Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d33670f5c905ae4…

MALICIOUS

PDF

85.3 KB Created: 2021-07-03 05:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b91d9b09b463de6838a4a88ca43cfc6 SHA-1: 7c0bfef9e3127e8112442ddcd1d789d13a0d8c25 SHA-256: 5d33670f5c905ae4f2700275b5b8c52d5f1ad30dd5464c087ead861de8302d2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=strata+and+co PDF link annotation
    • http://ranaghatpchsschool.org/userfiles/file/wuxirifonipurer.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/vusobumu.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/aee85b3b59b435f9c73a64338555cccc/xaraduturetimamopoki.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/dqcf5vkqj6eg8bsl02egkk3vo2/64460991561.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/54124813857.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8a4872729---livugoxupe.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/k5r08pfmrtb0p9q7sreckvd8v8/jejezasa.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/fovajejedew.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b94d1b4f670c66b240e4362986d562af/18186904142.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5be73b2f699b3623c5bed2c1b0a2ed80/kurixoza.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d19af3aaf---37264151240.pdfIn PDF document text
    • http://mosjob.ru/images/file/84621232380.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/41923285606.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4784f52882da0abafbdd81c6b56cc5ac/52339288961.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6658b4ddb28a39800713179ed04d0002/piwuv.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/tdbiktq88ub71ujt75fvurso00/11291493037.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/6230480229.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/nuseke.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/97bc4b4db1959dbc807588641e68b6e3/86369996567.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/eb5c8257d56b30e944f79865ba57b86c/seminol.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/suwixuvedi.pdfIn PDF document text
    • https://hagepoorter.be/files/files/lisak.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa156c41331---76062642185.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac480438363---ludexujejalawada.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 10000 bytes
SHA-256: 6e194da00509265715070a9331a5965faf4e06ab134e232c1bca1189c4772feb
font_01_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 17668 bytes
SHA-256: 34a2d2a72e678110ef5eb046cb7b25d487a3ef3494bd4fa9f5c0dc2e3f1583e4
font_02_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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