Malicious PDF — malware analysis report

Static analysis result for SHA-256 f116438a4132476f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 19:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 832ea6323a387aee1b98dd9d033a8195 SHA-1: 6ad64d35ca2bf1d6bbb2dd9df1c71cbef9cd577b SHA-256: f116438a4132476f86a1fb11a7c0bc4a63ad6a21c2d3d22e4d392bbd467b242e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to disposable hosting and compromised CMS upload storage. The embedded URLs suggest an attempt to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://stl-log.com/htdocs/cljr/data/files/35565493297.pdf In PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/rojedukiwumipanulonup.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/26370762757.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/24909356731.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/dilage.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/35997432816.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/rujafuwudowokesopufo.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/jobirowexo.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/tefojotejikojuda.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/1219853700.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/filerirevelupefor.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/10693945890.pdfIn PDF document text
    • https://migger.dk/userimages/file/84373391036.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/gexesuveg.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/kosedowewidedikero.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e97a1438f6---98731982829.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/nofatoxepuzupatune.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6cf94b74---34247949650.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/bf1ad6cd27e5713fff8a18fb85b3b9fc/71023494313.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/17643176242.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/losemogoj.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109070159472303.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/38050354320.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/rilasomovavagi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146587b6dee4---18517846635.pdfIn PDF document text
    • http://hongdacable.com/d/files/sotodolefukaxupofarawofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=wifi+ar+apk+downloadPDF 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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 17948 bytes
SHA-256: 5741b203be3b9eb40f7db58854da92279cdd0c32f70f15a23949d23bce4e5973
font_02_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 10264 bytes
SHA-256: 97c0ce5e3ec60996ed0cc4b982d74e6cd7bf87228bad4fb5f0b19f0dace7607c

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