Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc29bbc62ef7237…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 17:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af3da7c1795e111340ea5b67fd8b28ef SHA-1: d214fbf3a5a1b987b2d0b54d5a85516be5d4e533 SHA-256: ecc29bbc62ef72374cef8d9d3860433dc3f49c081c457859e94f27ede4ad84ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=the+new+grammar+tree+class+6+answer+key+pdf PDF link annotation
    • https://resttour.com/images/userfiles/files/77769645386.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d3ae7895---9449291393.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/37659131165.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/muwirevaxuximakigeku.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/xobajevefo.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/dojizolerurafufoli.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/pogefo.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/jigitujodadupedetonuwulir.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/44810ecfec55d284eec741479806403e/92253919691.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///22392070457.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/jibubagizazuputu.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/zamefimo.pdfIn PDF document text
    • http://yoron.net/up/files/36674513850.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd20b6261d---72110664386.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/redulerunegazove.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210906_140052.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/pivufow.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/60928390314.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xoxabukipok.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/60566275623.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/48258356940.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/82999109953.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/30036274563.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_off0000b13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC951 11276 bytes
SHA-256: fa3d99d8472aedd9d4152d4d059eec4417a90c0f6d4e036f48e61c8197c6ae82
font_02_sfnt_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 15152 bytes
SHA-256: 5213dcf70ea072e64ece1c6cf78ceb7528ca3c0c81ab082324b9988cee297a7c