Malicious PDF — malware analysis report

Static analysis result for SHA-256 f450cd23e389e78c…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 13:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24f355fac9b6848ec9ce33622a2a3a53 SHA-1: d6652a541c585752a9906c2d99b872149a665fa6 SHA-256: f450cd23e389e78c8a6e7494627efdec3a202cf1ed9f4f96389931ad0b9b4944
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://suamayin.biz/userfiles/file/19172229714.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ade88970d99b54cd466f81320ffa171b/43196981023.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/p4e3mg6vv4oa8s0tsv2ih757pq/pugofuduragexitevutifuvaf.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/rejokomeje.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/vadusif.pdfIn PDF document text
    • https://temahr.hr/files/wagizutetutudotuti.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fec21abc8---pasemojobofivunakexenas.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/27430067489.pdfIn PDF document text
    • https://shopabrang.com/images/files/monezotuzaxasulagi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7819a361---zesilexedezazasisapom.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/33443682217.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6ddb5dc4f---76877375844.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/83546271951.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/24646574952.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba058f9f446---18262864053.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/6082080945.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c51ee4a3189---zabaremimemefupetajiva.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/33930642410.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/de59gn0kb2ve659l727g8tk9pg/ravakogibobibi.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/cbd890b2f8821b3579cb61f4ebce2d9a/25402585493.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/63426581718.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202108042015218423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=implantation+process+in+humans+pdfPDF 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_off0000cd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD88 17188 bytes
SHA-256: 17e2c807030b46302e224de50598eaf4544ec7afdc30a90f789b2a9475387c46
font_01_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 10936 bytes
SHA-256: d887e56905a0c25271dc4412e1ff8312721104a7a862846ddb3f1dadc6dff203
font_02_sfnt_off0001131c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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