Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4093ac09cd993fd…

MALICIOUS

PDF

99.4 KB Created: 2021-07-08 11:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7336eabc46bfd7181fba150295b00a2b SHA-1: 83536d6d512cd615b08e7f13aa9bcfeea5765ddc SHA-256: c4093ac09cd993fdca1d25b717e90c1f52df3f8e5c2191bf3d05684cd0c30da1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, which likely serve as landing pages for phishing or further malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/88edc263ef3a421c891c7d569dc55a19/bogorubigerewumik.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cee0754f8d---20497386258.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/g4bii8rqu8c4m1gihqocgpu4h2/zirezitaditox.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/tawufumutefegakom.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/26360558373.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d7407486cb5b54fa2a904a41f56b4ffd/rapilixusaduragasidav.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c6cfb5319a787eafd86bea63ae2acc4d/lemunedorunolu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92485b881---35299363806.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb7f90de6---46811676763.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9d39ecfb50d7c07400197d7e0a6180fd/90605445973.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/farapipesigomozixowajaxev.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebeea41961---46624628021.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d0ab5d6d1f18872a83182e66725dbafa/64737522904.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975bd0878f4---40813843960.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/47999687852.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/97078967362.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608445a7240ef---pasovegodasasupo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c54980ec7---mamozavofotemuzivol.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210622204900.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a6d474ce0c6431862eb9bcf1941b1b83/dotilagofekezaza.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eca560a8ee---19943882465.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/70540280052.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16086e02bed44a---lowosumeridedikev.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8398add6b---9400537505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=alameda+county+clerk+fictitious+business+namePDF 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_off00012106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 11064 bytes
SHA-256: e1b5d650580056af65e492c060406aec3580287ef6247dc07d7fd66e7924a496
font_01_sfnt_off00013aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACA 17188 bytes
SHA-256: 0c70aa54d2cca0e2f34bd4f7613b41c9697de5588a97e96eb049eb2b1c5a09d4
font_02_sfnt_off000167ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.