Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa082b085dc7e854…

MALICIOUS

PDF

91.0 KB Created: 2021-07-17 19:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d8a360b8ba1395b1fcbea56fc3de1480 SHA-1: 94bd0bb249c655ad5ed97a1393b31b35b51a7b8b SHA-256: fa082b085dc7e85426ce114d7ce1cb04b8ca37142686aedb00ea1f3b1d343b65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988dcfa8254---suruzeporonurujagi.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b227628f7af---rawejunajakijomizowaxi.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/84113016356.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/04c61ed4889b17da4449efb30009e719/fanofavetosudijujebog.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/96345227522.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/91541546165.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4986eb0859---jetorurufusidirod.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/99408876409.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/96116167996.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/bukim.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/oivcp96keb807aepbnechmulg0/33127245292.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0ut9ohltdeu4eulq9msg4pvjt3/kadavakeguzomata.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/55680485721.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k12uma18gg65k9bbus3r2d56d5/61014080289.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a396843766e---zadapo.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/28549531537.pdfIn PDF document text
    • http://henca.com/files/details/file/12553385880.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/67bc352cce660ac62ce26ad502a9476d/77400383592.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/24859091171.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/90143009987.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/vitekulakubekireb.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/33922816727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=division+sums+for+class+6+with+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 11024 bytes
SHA-256: 6c730a9f7171fba0570f3598856ee563c8257ed16121ed83c8878a1b23fa6bb0
font_02_sfnt_off0001176e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 17708 bytes
SHA-256: 4c36739e2d2ef762d70e919cea166a4b995e4e2be7564e76c1ea9b18b70e662a
font_03_sfnt_off00014616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1