Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed000413b02c85f0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 22:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4bf18857d2487f3feebb3c75d0277665 SHA-1: 74111a28c0813ccac5842e341134c1f841c8c7f4 SHA-256: ed000413b02c85f0df7cda71ce1907bd7a3d84d83fb6d85432405a7ea7fb905b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the 'QR code lure' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ajmason.com/admin/ckfinder/userfiles/files/36526981308.pdf In PDF document text
    • https://alternativecarrepair.com/userfiles/file/nanenanalunabofilateporer.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/vatedalofoxatojosixi.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/79582054296.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090718595273499.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/95305717676.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/pefideloba.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/sitolafakubur.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/vijajulubufitofamaj.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f462ed714---mipenisusogakojefo.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/dakaliwutajawe.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/jepepamezurixupud.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/14841003762.pdfIn PDF document text
    • http://packamate.com/userfiles/fuwisij.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/gebaxudumamosarexin.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/78488742048.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161337f6fdd9dc---46621075812.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/xinuwumugowazaturam.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/92557754998.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/bawupowemi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a59577a21741ebde1e402a5e18fdce6/jinanokiba.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/87245439142.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/belazev.pdfIn PDF document text
    • http://koutingchina.com/upload/files/bulanopekokoretixur.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2b05418a15b756491ddc73640ffe715a/tiwiluniwesepotilovakem.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/70523005523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=satomb+s3+qr+codePDF 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_off0000c621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 19088 bytes
SHA-256: 00fdfc85ba42aae3db3c42af5456343f4a26ace06b4d752ae8dce58f7078db2f
font_02_sfnt_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 10820 bytes
SHA-256: 0a07d97ed6556a957acb6490ddf9b5ae7ec8c67fbe485e1ed075b4ce1b7f1137

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