Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded7160a7e567093…

MALICIOUS

PDF

90.0 KB Created: 2021-07-18 09:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b6e5e72b6ed8b4faa3f375b0cc71ce1 SHA-1: 24e310cfb7bca88a42437e9a417f3ab40c2094a5 SHA-256: ded7160a7e56709309efa5ec1a64efa9673a6a79b53eb20c1c679a815e5c9575
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b557564b7e---61766913983.pdf In PDF document text
    • http://igabana.com/upfolder/e/files/20210615002325.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/11034139825.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/piwarovikawopuxawarajip.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/mememikedibetinadi.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/fazagi.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/83591399791.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/birugisifakovuxojopikatak.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7c3095e74e34fc1620934cd22d2055d8/72716005616.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1d925269f---27179598371.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/94542487709.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/78867918470.pdfIn PDF document text
    • http://sbkf.org/files/files/rifexudifadowepi.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/50449322898.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/pulupigebelamibulagema.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/tubaparowunej.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/42262734959.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fcf92ab42---8823726878.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa58c8548f---bopimoxanojanenobotewipe.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/loxosadoluxapamukutewoxaf.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/xexodufu.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/60826003421.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9e33a7901dd140db034a969a704b7c38/poluvenifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=terry+rozier+dunk+on+kdPDF 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_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 17812 bytes
SHA-256: 3d1c480044d6ff5645f22b345d8d8092e28c9c0718a7710679bdaaae1fd87dcd
font_02_sfnt_off000142df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DF 10096 bytes
SHA-256: 9cb30c2d510dedeffbfe20faa4ef5f734083593b029a89be45c9183d09b8dc73

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