Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca079f14020708ed…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 09:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55692cb2cbca58594f32d0142943fa1f SHA-1: c0f108817a274dcb9f12b68b25718b502acf2ab7 SHA-256: ca079f14020708eddcb36446ba98227fb992ec162251272c5fdf70bdeb955de6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also features a link farm pointing to various URLs, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute further malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96e0f2b41---gowukuziw.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210516034710.pdf
    • http://meuble-tunisie.com/userfiles/file/95058541994.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/putelepafifutuv.pdf
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/sedelipimuzizebad.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/unendehlbtoahh9h4qimnnpda0/xomakodip.pdf
    • http://alt-1c.ru/userfiles/file/47891244622.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/ef5323a996cfd1696d3959f1ae48fb0e/varitimimemabaxoxomozir.pdf
    • http://mackyz7automotive.com/js/upload/files/gerojes.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e525128c8---26353533762.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ed87fdfaca32801e0d5ebf7aaede4423/37273574889.pdf
    • http://begemot-rus.com/uploadfiles/file/2021062608541973499.pdf
    • http://peaceinsrilanka.lk/userfiles/file/fegopidabanajavupametotiw.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcab9dc5da---4866282913.pdf
    • http://aj-freight.com/ckfinder/userfiles/files/pezopod.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d048942abab39081fb5c0c3654cd35c4/49653698715.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/2hehovt7pmgnlkmrpalq0fpm74/43214973541.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/24615223688.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133984b883bd---nunuroban.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5dac97e5---beraromoserapu.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/550631364.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9465e5351---59420696797.pdf
    • http://anatolianlgs.com/userfiles/file/61607262360.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/8895012028.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=data+structure+using+c+aaron+m+tenenbaum+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be82.bin
87e93f2e25c31826608846abc650927743d5a294e0a9186fa59a722b13f4d0b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE82 17960 bytes
font_01_sfnt_off0000ed15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 16792 bytes
font_02_sfnt_off0001052c.bin
828a957bf0a0cee01da9af781fd3741219e9fd698a228ff857ec3713d3c47b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 11156 bytes