Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9649f22b0a414c0…

MALICIOUS

PDF

97.7 KB Created: 2021-09-02 15:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 40c6285e1df480bfc4183f2314592e1b SHA-1: 9d4b992658fbafc2ed1fde05646e4d4fd03e4ff8 SHA-256: c9649f22b0a414c09686ed2e89f7292befcfaf715d253a967c169c0a3212c215
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a tactic to manipulate search engine results or redirect users to malicious content. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common method for executing malicious actions within PDFs. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=pic+microcontroller+architecture+pdf PDF link annotation
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dac9fa4f62c---vipomadawegolorikexegamix.pdfIn PDF document text
    • http://vce34.ru/attachments/file/rosudebivobemevif.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607708c63fd92---wuromosogefokad.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/46314462812.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/ramenarajitoj.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/30961170448.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160837affc82fe---xubezoxuz.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ab82858e5---1759990934.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e1427977ad9cfb22433d8d7b563c4763/68908390867.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20217154214.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/052085db62eb9dac65945696592d056c/86134887531.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/85876756506.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/42965666716.pdfIn PDF document text
    • http://standardamulet.com/files/files/guxilabujezonidem.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a965673e---10910817517.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9afbf3edad---29817308973.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/bujepum.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/diduxedawezi.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/lotajalewevag.pdfIn PDF document text
    • http://candientuvibra.com/images/file/36673662535.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/6419615855.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/wejuzinavokogepijana.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecc6c6f79---goxadepuxubupegetinegax.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d33b861f61f---madufabumudixezujig.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/98794139183.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_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 18816 bytes
SHA-256: 2fc5cc8749c142ca5c7a9ade5111b2f549dccad56fdf9fd6499a8590b6fdec57
font_01_sfnt_off0001480b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480B 10820 bytes
SHA-256: 9cb32a333a04990a31c3a2d1f5a756d1c51d31b91aa44ebaf630626d281bd3b7
font_02_sfnt_off000160bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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