Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9704d1d3f5c84fb…

MALICIOUS

PDF

75.1 KB Created: 2021-09-23 13:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49c479ad4a9e1e19ff75c02cf3b0f7db SHA-1: d4412635d5a229d1f7f5a977f6353be3b7a76df8 SHA-256: e9704d1d3f5c84fb055afaa0019dc6428b5f3c5d25316b0a1fd4131fe804149b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm is designed to lure users into clicking on potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=merge+plane+mod+apk PDF link annotation
    • http://se-ty.ru/uploads/userfiles/file/gigudifu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e7b25859997771abfc410ecbbc692469/1016312022.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/51258571798.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/95388589268.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/pojisox.pdfIn PDF document text
    • https://camphacement.vn/upload/files/40437951667.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/53598258478.pdfIn PDF document text
    • https://limadelimon.com/images/file/73066262055.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/kenenixutawadonepilofe.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/60164560947.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/31480904948.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/82781607442.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/tivefukejedukowosapabapuf.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/9732871096.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/21921049550.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c86d85fcf---47880435030.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469f2b40760---2896412293.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391bde27e9f---72888537266.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/vuzegalutemojurunemu.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/49083306494.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/40662798126.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/50592079945.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb9d5c273---46883150563.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_off0000c1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 17628 bytes
SHA-256: 81f80824bb3d230eb1f3d9e9911b5852aaff021a9aa3254b7eac66302881eea1
font_02_sfnt_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 10464 bytes
SHA-256: ce6629a13bf7d71bdb7ab8ebbcd4865e850ee093e97cb2f35c88f6c126415e8c