Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc9a4de74127672…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 14:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75b7238c2b2ef81c3fcc1c89fc0b37e3 SHA-1: 076113ea6f41d90fc5aef5045ed60d740f57f835 SHA-256: cdc9a4de741276724376d4e051d232e2568eeb425266bc4e777344fd44c4c99b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=kpcb+internet+trends+2018+pdf PDF link annotation
    • http://ayhancevik.com/images_upload/files/gaxubujijut.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/14583095071.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/jokope.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1625621255.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c013258e7---81276107723.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/905b55736191cf6589ef9f092bd391d0/36390745297.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed630117cd4---xiwibovoxixotefetava.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/96629902978.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd4cf88f64---kiwazibegeban.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160961f02bf145---16104286219.pdfIn PDF document text
    • https://csn-alliance.com/data/files/zenivake.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7pd3ko0qa0k367ru44nao690vi/vugedigevusixipasotodika.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a6ce771d---55941869081.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a668f9cec1a74e7946d44a246bf99c5f/57748137301.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/pepegirujuxorebukivosolof.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee66bde9e1---50375128709.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608687b10df26---nusep.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/vazipumeti.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/89194955365.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/15/tanavinolafodalosom.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/38319379986.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/27294103434.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/livuxopejidomeliw.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/39973337162.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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 19468 bytes
SHA-256: 0e1224e1e7d59dc856d1cab1f0f0e4d44f515ac63ee5d2348c6e4c3d49f1113c
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B6 10920 bytes
SHA-256: 23f3d77e910dba64aaf0a446b48e0cde24b8c5eb965bb9e0b250ebeed1442ddc

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