Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cea9f70fc84a903…

MALICIOUS

PDF

73.0 KB Created: 2021-09-25 12:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 03dc9722be0c88360e245d4881100480 SHA-1: b802f8c7a13f6f5c73e4a30bf72d600e6a2927d8 SHA-256: 7cea9f70fc84a903e4a95e67122ee7b5b854094d1fca72a9612cd10f69becc29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://conditum.nl/userfiles/file/7812451648.pdf In PDF document text
    • http://qlionshousing.ca/userfiles/file/tugajagebekajed.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/84116051919.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/suramojekebafikuwan.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/vujuxew.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc64f8edc9---mopafepiroxilakibule.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/60370868564.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614959c68589e---molarukejojisotikudidemu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/4867400137e70703f31b1d7c7cc6423f/xuwagesivuzu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4bb6b176698a6c0405140d65fed7fe9c/bovinokugozupiwinizu.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/gobiwubugo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nizore.pdfIn PDF document text
    • https://xenonsvjetla.com/files/76190783622.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/99460764930.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/57047669209.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161358f0e9fd01---xoxapove.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/tamavuxikot.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/5537222325.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/57283884072.pdfIn PDF document text
    • https://tsolisp.com/files/file/fevonomonesazepoju.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346abb13b7b---bakikizulelap.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/6494508890.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/4988476086.pdfIn PDF document text
    • https://redfortfireworks.com/ckfinder/userfiles/files/36470123541.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/fagabogopidazebejamujife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fnf+mod+download+apkPDF 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_off0000b7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDA 10224 bytes
SHA-256: d226ecc309498164f999ca00b386f83fa743a4f1862a981a495500699c55251d
font_02_sfnt_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 18856 bytes
SHA-256: 5676a1d9fccc38079c3e2345be455cbec393b9ea17b95f702e6e6d6989c6c1cc