Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b309310e4400aa1…

MALICIOUS

PDF

82.3 KB Created: 2021-08-30 06:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 13e17b398d1f8caf98b575f9771a69f3 SHA-1: 696cb9b5c0061af0873cc5bfe41c7da9cbe40426 SHA-256: 9b309310e4400aa120090bf619cb2b838c362a7ca5ebc5431c2b02ea43dd00a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/muvigi.pdf In PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/70252853162.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/70a32712a7b581de7067f99dfd7f6dce/31381816806.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f12feb404---xinizumar.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096722b452fd---20594795758.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/jasetinuxixu.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/pukexejezijodolatoki.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/pusuxos.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/gufibaturidu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e28b39b94---33005784729.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/va0e89jn3q0bn9bofe427r554d/pavakutixugofekoj.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/bawosona.pdfIn PDF document text
    • https://shrisaiexport.com/lightspeedweb1/file/pisuzavaraginal.pdfIn PDF document text
    • http://www.bash.cl/media/file/27925286626.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/fnnu15s0pvk9ekcts3stjs38ob/77143944562.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/xusebozowosufogatanibul.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/75667556194.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d5819111---85978675701.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/lenepunesidazit.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/20e366317bb58f2ac6fd42d5ada31702/biseneb.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/89006295208.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/ef1f631c2a0297f03801b90ef967acd0/bivigetufiwoliwi.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/pixalaselukepo.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/59189513182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=giveaway+2020+iphonePDF 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_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 17364 bytes
SHA-256: 638cb4427c3ac476f83e9de1a9b34e0d47322e1f88fdcd359d97ada9418c4081
font_01_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 10484 bytes
SHA-256: aab8b72673eee8edcf17a893b36448a84f3b116a6b9f1168b3afeadd03a201dd
font_02_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1