Malicious PDF — malware analysis report

Static analysis result for SHA-256 98367cce89273786…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 07:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50a9c74ec7eeda5eabacb226350a23d0 SHA-1: 970f6c503537b2acc64fc770d15ab482305bf45f SHA-256: 98367cce89273786dcaaf42b1a357dbaa37b417355cc99b97aa4ff362eac91f0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting, likely intended to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered link farm nature of the PDF on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://unique.global/wp-content/plugins/super-forms/uploads/php/files/be05652a753fc0ca86a8e7d812424913/dikifisudurugu.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e00d0631b0---42303381568.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/24839294475.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/80478177489.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/190421353113.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/wikiwimanejo.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/lipovadawidexenuk.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d7865a309cab63696684c2fbeb78fc0b/pegegitakowomatusijere.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/22849788036.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210606064549.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a2b9ce40---50987611336.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/22c8e4d2ecce45860ecbcb3b2a34fbec/nevepetetujut.pdfIn PDF document text
    • http://michalbaryza.pl/ckfinder/userfiles/files/vumopetipedozupusuxuzenat.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/83450662429.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6e21522bf2bd25ac426022ea5466d844/vukejinimesasobo.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/14718712620.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/zanosobi.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/jerigagota.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/giletazupiresiwetagiwexep.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/kuralasowal.pdfIn PDF document text
    • http://fotossc.pl/_files/file/sisikexipo.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/9511675104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=assertion+and+reasoning+questions+biology+pdf+class+10PDF 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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 11448 bytes
SHA-256: 860fc3046fea4fa9887f018a10b9801fbc4bb14ffb00201c412a2c246bee2cc5
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 17852 bytes
SHA-256: 594de200435ef9b13d870f8af624f7faa44d68c19a3644ece8b25bd85f71f0c1
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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