Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed7d233124fd002…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 06:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b26eeedd754c23edbc2e72d4b6871af2 SHA-1: 27ddc9964c0b12d9e819e972425831e730957480 SHA-256: fed7d233124fd0023d7bec29bd769bcb7ae16b55d7180fe6fc430ce8a183cd34
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a social engineering tactic by luring the user to install a browser extension or update, a common method for credential theft or malware installation. The document contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or distribution campaign. While no scripts were directly extracted, the nature of the lure and the external links indicate a high likelihood of further malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crysiq.ru/uplcv?utm_term=my+phone+app+keeps+crashing+android PDF link annotation
    • http://www.multigacos.com/admin/uploaded/fck/file/94000971750.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/11100987526.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/murum.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/be17220ae487f88b5614957616e2a80f.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/nuvexajupexe.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/gavisifatonupuvurepe.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a60f1dd3ab56b8ec5bc4a4a1a00dd7a4/39953638290.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109101017459275.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163184243363160401519.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/netetepofumirupepovo.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/54872043010.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/42019043313.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/70769648775.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c766a3b9---lufabejabuvavazaw.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/worebivepitud.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/josilofuxu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613b040c518df---59442473802.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/19708387592.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///sumefazumikubudokibolivof.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/jojipogapu.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/22253506275.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/61974032552.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/jivijunagigopajesabuj.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/pifipiserilogaxixabo.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/lejetegudafan.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/pekokemezukubadobiwuwade.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_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 17272 bytes
SHA-256: d41408cd0712b889ea6f1113ec7052be608623f03f920a5dd4f81ad64e3ace78
font_01_sfnt_off000110c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DB 10848 bytes
SHA-256: 848ce5d9df1284a7133a6569c8079df4d97adcc9c560f6d7094013fd544e9588

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