Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca803ae8549208fe…

MALICIOUS

PDF

74.5 KB Created: 2021-11-13 09:36:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3124a8cfa4e3c60fad16cf6529f70261 SHA-1: 0fca88912fdc7a6174a3cece55eedc78725f5fea SHA-256: ca803ae8549208fe517ff472b39ffe639547cc7bb0155592e25cdcd1e3c01f32
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple potentially compromised or disposable hosting sites. The embedded URLs suggest an attempt to lure users to external content, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dungcumaymoc.com/Images_upload/files/82452132385.pdf In PDF document text
    • http://restauraceeverest.cz/userfiles/file/4754988712.pdfIn PDF document text
    • http://www.centralperdana.com/file/34842948453.pdfIn PDF document text
    • http://decentlogistics.pk/survey/userfiles/files/tudosidimurosigulan.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20211028042545670.pdfIn PDF document text
    • http://gotween.com/userfiles/file///37233126124.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/nudipot.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/1120199613.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/jbeit9bp4feihlr1qurp8fraat/gekamaf.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/bexadaxigelosipozos.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/11864040399.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/45842033487.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/resiwowimizosiguregugu.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/b5ca87296839534c2a64de306555d9b5/18621343408.pdfIn PDF document text
    • http://tongweivietnam.com/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Filesupload/files/zotives.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/18039180550.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/34669287201.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/pumufixoditiputupekemurig.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/60465155186.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/nejezujelobufudu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616a3e43dc5f6---bogozudiruvarexoje.pdfIn PDF document text
    • https://eklyps.net/images/file/73984847076.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/92403429954.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cd6bb320d4bc0cc5b5894ec3411e627b/zulafamifu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=how+to+flat+tummy+in+10+daysPDF 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_off0000be05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE05 10748 bytes
SHA-256: 6576b1c20c742ce91711dae91e0401d0a19afcfd8315f54ef586aa3da256046d
font_01_sfnt_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 17844 bytes
SHA-256: f9a7114675147259597073145ebed9f9d5422f988096f9b97a96c59e33e8b4ad