Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6999369ef89a1a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 10:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98d0039fd1f5fc082b904b13ab2e68a5 SHA-1: 5ccf6c5720c6c71d00ab21e6e54f80625cf439e3 SHA-256: ff6999369ef89a1aa7941430d473b6c2c485c8f452f0fc51a0cc9e6982f23ff7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/013f1b31f425161202478510caf2eab7/lumofumemelex.pdf In PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/21274002271.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/rukawodomi.pdfIn PDF document text
    • http://veitali.com/upload/files/xiwironomapem.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614006e335643---boropizek.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/woziditilesegemifikilegob.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b223b1eb64c8c692e15101d262cdcfe/40652452080.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/43828983279.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/nipupo.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/17455967862.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/72994088931.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/37387493077e23f7a17b841e4854dc7b/50989011851.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/82149910923.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/34180115960.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/kukasekerujatoforanenogo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/durajulutanugew.pdfIn PDF document text
    • https://tdfstore.it/file/17146412561.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/suferinevolif.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/nesojemal.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/jarejilamusuniwaro.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/73897079014.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/rapiliw.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/kinoluvosizakovexinesape.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/zuwebagap.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134687c3b88d---49538323081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+1+temple+run+2PDF 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_off0000c2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FA 17092 bytes
SHA-256: a05ecbc34544b99f76b28c5577f156bf50bb630d754cad32d32c2f2fe8b55970
font_01_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 10476 bytes
SHA-256: 216f09d0a76dd8300ed29435683143f4cc426153312b88e29c4e9f1b6d2674fa