Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61ff10f8254b692…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 23:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c84677f7c5fa19db7cfaa9e214dfcb65 SHA-1: a36ed1f637ed7735ed67cb9abc81891be8bff4dc SHA-256: d61ff10f8254b692bb27dfb8cf97676e990ee682f7a176daab1a9c3e273ca143
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=asseverazione+sismabonus+pdf PDF link annotation
    • https://ruedi-leuthold.com/userfiles/files/60007876169.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3695cb8cf867a7a38d67bf72e938c373/10063750277.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b849b019bb4---87848305661.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/pasuniwa.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/48502382186.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///42387341012.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/66940869323.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/fetewutifavirukafudij.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/68414555662.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/hfb3d6gdjrmdmg8e7oclnavq9q/vovatipabadukamiwe.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mudoneje.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/duxivefatafuge.pdfIn PDF document text
    • http://chromavials.com/d/files/5390927694.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/tixitobegezadirifitimaxe.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210721213508.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/velufobewopo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e4896aec9---16500908968.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a94a47b5a5---gijufegotalitaroxedoxevu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/niwawasa.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/gugabilik.pdfIn PDF document text
    • http://teresachild.com/upload/files/digufezumibidijakakemude.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_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 10864 bytes
SHA-256: dfb4daecacc29e4bfa7902b8e2252b5f3c33ef786f4edd51bb646ea87f410a25
font_02_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 18432 bytes
SHA-256: 3a9001e04a0fa22b2e2e7fc2e45ea7aa85a120ca2b70fa53e988803a58378082

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