Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecc5d162b295349…

MALICIOUS

PDF

88.3 KB Created: 2021-07-04 23:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 58d61a11bf63162ea66777bb11e3354e SHA-1: 43c6785d8b2abd295bd024b2cd7c18319e65b07d SHA-256: 9ecc5d162b2953490c0a6e37242489837bb856d535ce6a802890fa6b39522301
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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 http://duepassidalcentro.it/userfiles/files/gimat.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16096ba0ff3f0e---tomukisirox.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/wutirukigujupaxugitebuvuv.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/51652195758.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/25db91c2176bef52c5af9614e607fa1e/kovirixufigaruge.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fuvemizan.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/05b98fffdecb581589a0dcdbcf0507cc/dadegedozupuxu.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/38887715647.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc0917652e---ziduraduvovu.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/miwelugozevigidow.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/16690969077.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/212012417038.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b9ca2ef4e1aee79b7af7f072207cd26f/bodeliborijefofor.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/62955815035.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/9mjmitpuue1dk39qreps1nsg67/lebukiwero.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/gibegaf.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098303130412---73680723700.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/lagegen.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/32116350049.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/28752222666.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceda5016b03---46337056276.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/korisubesadomebup.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/add5siscneekhom1qjb2ctkom1/wudizafun.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/14896757906.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a84afc7f643---gipikojatofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+collect+primary+and+secondary+dataPDF link annotation
    • 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_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 10868 bytes
SHA-256: 3c4da0de71530341478f34edb2d49881556b7065e5e9039df88f3fc2f866deea
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 17348 bytes
SHA-256: 10be9976dfa0aee407111a171c76692b9cc13624787c8d6f4a4cb26f6e171289