Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8c8779849678e5…

MALICIOUS

PDF

76.3 KB Created: 2021-10-06 22:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 98863ba71eef88bd736ecac7e29922f6 SHA-1: 29817ff4e87315e0fe8540d89f6325043bef2616 SHA-256: fa8c8779849678e5c190417304af55c1f6d0e3062aaf2d84bace0f879736cb29
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 uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The presence of embedded JavaScript suggests potential for further exploitation beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=how+does+cyber+currency+work PDF link annotation
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/4e76a7c9b8665e3bff24d9a3f8c2801a/90447114593.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/nazegugak.pdfIn PDF document text
    • https://shevian.com/images/file/voboposuv.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/2523023637.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/62871918942.pdfIn PDF document text
    • http://adriennemason.com/assets/files/71579424793.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/44164671844.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/76168015450.pdfIn PDF document text
    • https://virker-ikke.dk/files/zirezasugenag.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/74073578452.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/36179744868.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/84571767811.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/53149641449.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/47447837797.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/debidiwepodovibera.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/797528169.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/91255868834.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/fuxobumolamudaninemukono.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/fodusepimibofijokuzozokag.pdfIn PDF document text
    • http://unibox.lv/files/text/tidozejubudeximedetuza.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6370df68401cad1fd9c2778d0359742c/gamulap.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614026cf9fd23---52829914583.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/juwibawuvewa.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/89397244285.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_off0000c57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57E 10488 bytes
SHA-256: 2305812ae87fc7ec920d0fc6002508e1b438120f3574858cae817748829c641e
font_01_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 17884 bytes
SHA-256: 826d07700b5354285b78948f2ba7bac09d682e63b4a470e6d061369c9057c362
font_02_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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