Malicious PDF — malware analysis report

Static analysis result for SHA-256 60c4cfba21668c29…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 15:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8058231f0f7cb558927aac1899719963 SHA-1: 32e7287458f9caa9ec724898611e2a010ed32251 SHA-256: 60c4cfba21668c29c31682a10e2c7aa80852e936b4e73962f47e4773771d6afe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to obscure the ultimate destination. Embedded JavaScript was also detected, which could be used to facilitate redirects or further exploit the user.

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://pistant.ru/uplcv?utm_term=stand+alone+solar+pv+system+pdf PDF link annotation
    • http://esoftland.com/userfiles/file/23109926620.pdfIn PDF document text
    • http://ubest.ru/images/file/xuxefoj.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/40293066067.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/vujugonuligopiripikese.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/859c9952b47d6e5fc49fbf709b075a95/nonisu.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/78354476795.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/74450685523.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096d9e66ba54---ropizekobumeloz.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e550ed29785---gibokakawubigeb.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4f1f2c37d---90275840874.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/66358607742.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/xekipizi.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/16429465250.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2a4c0cce2f9c3dc5a721eb06a8c4a216/veparapuganasisatijow.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/bozipom.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/f431e0b90113f1bfe1e0896c16b25385/4401688240.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/nenad.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/20394111473.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/ganipigogop.pdfIn PDF document text
    • https://vientangluc.com/upload/files/wesibusikimere.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/jatufuzada.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/zafopobunebo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdb0239124---55632949714.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/4278230660.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/lopefejokuzolu.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_off0000be66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE66 16480 bytes
SHA-256: 7eceae620a8f63e099f418ef2e331b12989ff46ae7a5fb21a2eb1fcbefc9cf8a
font_01_sfnt_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 10820 bytes
SHA-256: 59caa5f8c7f3e103e691eabc15d8da6f300342ec650f9c71123c330a61bb8443

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