Malicious PDF — malware analysis report

Static analysis result for SHA-256 954c441c48d690e4…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 15:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b065bbd579475d076b94e722783697cb SHA-1: 1f41c1eb2d52ec9449fb8bf79241b39471ce0246 SHA-256: 954c441c48d690e4452d2729eb2efac3e08b3478082ca31f5806fe657391c084
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/40508a2c8a3446b073bf0ccc318989b5/73489153665.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608255d1acbb2---3250726908.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/8tvlktdl6t8p2358202koi8j8t/tonafuva.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/89280400887.pdfIn PDF document text
    • http://aurora-c.jp/files/files/novirele.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7816c9d15---38977836154.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb19bdf49---85356816134.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/d3c2f48622613f576ca50aba19eba07a/35067888554.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/a4e69323185208942214ad8b2980c498/55700462194.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/54t1kl43qaqt9ipmf4076ln51v/pukoreboxakabimugus.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/e811d6989df28471dc21f972c46c547d/bimagenevafakinidame.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/daxanefesirazijavapexiso.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/7eb1c1290385db8b1bd57d443a2694c0/ruroxebibofizame.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/75434ef7f4f434e40466c85024e82e7a/fomag.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bef5aa3080---wijarezuruven.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/49027234167.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/39525532093.pdfIn PDF document text
    • http://strandedtattoo.net/file/nifopovemizojokolokopup.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/sovamepizebuzajoresajet.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/muxugukilufabab.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/timewovusoranuxobapodikot.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9b141f89---lodizibetologitogiloke.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/xuvufaputumid.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/bea7bce2a1a4453e2e0f0a20a8e0abc8/kubejaxisakagana.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/35891788914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+bach+piano+recordingsPDF 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_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 10940 bytes
SHA-256: 9e3f47d133b75e482a69fe0af6cee2e59ad9683e6f056d232f6dbdd668c5bca6
font_01_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 17340 bytes
SHA-256: cfd74c2f68463235b58c19ebec4eec49c35ee1a28ef31373bfa8966935fa420a
font_02_sfnt_off00013848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1