Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f0faee3a15536d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 06:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2da8e03815239d6269c5d1d43ed0b85b SHA-1: de20c2833f886f7f78bd550e2e3721d65049ddc0 SHA-256: 78f0faee3a15536dcec5f83e8897fe4596cbac3b355b347a51e0392f09c308b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=backpacking+merit+badge+answers PDF link annotation
    • http://antifftech.com/uploadfile/file///2021062706201398.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/66157872252.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0408ab641---fadavisamuvozuliraboz.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/tanagowanumamubesa.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c749cb0ae7bee46dc038a7fcffb01d46/fesewemutomiv.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f20f64d9e5---9632017391.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/zinar.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/46594949762.pdfIn PDF document text
    • http://jarosi.hu/files/file/40735408197.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786d7f19cf4---82368760544.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23ff17679f---76959394918.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/68058270143.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe3561f8d---xupegebumawibafota.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/85863165944.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/69553516161.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e4960b81d4e221f50b8a68f1cbf7532c/67823132172.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/fujavosu.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/menopi.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/pazomilemopebi.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9b6ifin38u53u5hmpvk93lsci3/17923343382.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/857eb2a7fd2bdd20e16c906a3649d53a/lanex.pdfIn PDF document text
    • http://recrute.fr/files/files/97671425930.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129c18272f19---19005912560.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/69250347366.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/84468562542.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_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 18124 bytes
SHA-256: 84a09161109025d7ba24faa045547f87261ae5511f6cad54470e1270a8e0c2cd
font_02_sfnt_off00012e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5C 11064 bytes
SHA-256: 38f1806103aecaca66befa6912af7489bd2b20efa5417e8b8a3cd392551a5dea

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