Malicious PDF — malware analysis report

Static analysis result for SHA-256 b621df0b082ebe98…

MALICIOUS

PDF

79.6 KB Created: 2021-06-30 11:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 110f811d0c6b24dbacdda06f694de33c SHA-1: e58af6886955c2e8b3d4520a7ca4ebd198496798 SHA-256: b621df0b082ebe98678dd573527db2954ef66a4aca089ac7e738f43f337a104b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=sathire+odia+movie+song
    • http://axwelindia.com/uploads/48642872238.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608011618cd77---120650846.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/cfc94b16bdd681da830991a30ff493b6/14983580280.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b12105ce8cdf84dd5b1d7ccb3c3ae4c4/mimidekojafabupagaxipari.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/fafegudit.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6921a3ae---vatozetur.pdf
    • http://rilta.net/userfiles/files/nubezimorenelezipebe.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9f7be98cc589e868ff05cf19c37544af/69739316887.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e9b1e2783470c7cb6eecb2d09f0ea20f/parabewewegukevurigal.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836b255891a---loguxome.pdf
    • http://gapoom.com/upload/fckeditor/file/83293848370.pdf
    • http://nadiadsa.org/userfiles/file/vomavujula.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec1c6c6d7---sirekutisuv.pdf
    • http://parkhigh65.com/clients/4970/File/lisisakafuvivet.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fi1kpevn5dsonqn492t3bo1nb0/50454367099.pdf
    • https://sklep-pinokio.pl/web/uploads/files/1325932808.pdf
    • http://usmleworkout.com/files/file/gofixapidawepobo.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9b511547d---soxarazupejod.pdf
    • http://aaaexpressac.com/userfiles/file/vujotegimonovikulixasuxiz.pdf
    • http://robwalker.net/fckupload/file/95152646858.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/fokoho60e6bipgbn46623acjm5/ladanojexatuzudez.pdf
    • http://kadh.kr/bobod/upload/file/xesabevu.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160931e143f881---domikubadosutajopowem.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/moxunuwurirusori.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852f08eafbd---10688120600.pdf
    • http://dinskayarealty.ru/media/file/16903643016.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_off0000d37c.bin
f76b1f4ddcc43cdace755deeab5fa22692ab017df679a1c8fd2a04f4c9c1705b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 17248 bytes
font_01_sfnt_off00010043.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 16792 bytes
font_02_sfnt_off0001185a.bin
3128ced908980e0873167a989db2d6f0e05ed89d58c83b49852fe7888fbd9598
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 10792 bytes