Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd649f561cc15582…

MALICIOUS

PDF

74.0 KB Created: 2021-09-10 00:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 993b5761415fbe002971f52896f20c24 SHA-1: 01149bedc3c3d50670ea093a64d3a9c77c46f5aa SHA-256: cd649f561cc155827dac47c61006f65e8e3aab47af2bf37716ad44b3f56aa0d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as 'Pdf.Phishing.Trojan' and contains numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate redirection or exploit vulnerabilities. The primary attack pattern observed is the use of a link farm to lure users to external sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=hawaiian+words+that+start+with+k PDF link annotation
    • http://debseven.net/UserFiles/File/16950738224.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8abb3b8f---54257072961.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/laveda.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613049f079844---rilodurefuvobuz.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/44057796017.pdfIn PDF document text
    • https://jetaime-shop.com/files/vapedejijavanumewiwex.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/dotujefegiwabakagogogu.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/24984703677.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/9bbfneurgfqtc0v7p3dk9j9079/79108915089.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/piderutagime.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/faxefipazu.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/34320379743.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/dutipasomegapibi.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/52281271435.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/40622737160.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/xawinogatonosoverajezunuf.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/6562083954.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/87287924902.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/63997323023.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16138cc3410f92---loneno.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/73dbc703d4a647962afe8b9e82481bc8/60912065658.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/88769796352.pdfIn PDF document text
    • https://proxus.nl/file/37106619569.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/mejale.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_off0000bf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 10336 bytes
SHA-256: 63285c02428dc02febfc1900c527a6240b372dd6e2ca3a09a286a6e11b25139a
font_02_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 16852 bytes
SHA-256: fa7d0fd89f25511304e0e1891113c0b7ac1f38f5cbeeb3c98ee1c8826a8d28fa

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