Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d999cfce6f8386…

MALICIOUS

PDF

74.6 KB Created: 2021-09-22 20:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c806595b7d60aeca70e54f2db6c7a93a SHA-1: 0d54d6a69c29ff9eb88da53dc705352d6222e65f SHA-256: 90d999cfce6f8386b3faef550e9a9c9e07bf55c2fb97018e8003cc5246da73f1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of these links and the nature of the hosting indicate an attempt to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c3203763---xofopalux.pdf In PDF document text
    • https://kolegium.inaheart.org/upload/files/kifalodima.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/6949638856.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404e13d5639---31497004931.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/19066011581.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/30724799017.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/13761627014.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/40169621313.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/boxuxomurexiseti.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/76365359776.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/zatikebefebazaketu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1a28dea07c44b67d011c9ed65375c7a4/82075317978.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/262ed55df56807822ecb6670b6ad448c/43594277487.pdfIn PDF document text
    • http://sentai.cc/data/file/20210915_214436_860.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/29553453539.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/39064457456.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/xobufojiwimovaxeroketeka.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/wedurasimutunugovilex.pdfIn PDF document text
    • http://speckrepej.com/upload/file/57442752867.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138199c0a0e0---36588805439.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f204ba9bba---40879432243.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/49026704328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pk+xd+unlimited+money+and+gems+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_off0000bf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF23 16944 bytes
SHA-256: 72a0a0dd72e7d835f7bb5dd0ab636fea2f4e522c9ce5efc26efa4288d2e280d9
font_01_sfnt_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 11132 bytes
SHA-256: 4b959708138c78cb444febebe8e535e6888dd2d176e4ec8b34adb71ce2e33d92
font_02_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1