Malicious PDF — malware analysis report

Static analysis result for SHA-256 de36a71c8de3e93c…

MALICIOUS

PDF

73.3 KB Created: 2021-08-31 19:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 680750b2adb59653161a9b13cc765f14 SHA-1: 8fb1674d7d9f5d4697d237c3c3918e0a027d334a SHA-256: de36a71c8de3e93cf0ac98edb14b5519226b2b72c9a9940b296c2d207bb0970e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://kpnamboodiris.com/userfiles/file/15291558580.pdf In PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/tigomisarisanopekuxidadar.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d581ed301---bibejubesinafojaxosumibim.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/gujovojujiwewizon.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/eef02accac14f1ad406af0926591d944/55202704843.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105583ec96a3---34382645539.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c568c814e5d---44910215212.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/wizilugekumo.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/jasuka.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210829041746_1188068175.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc82c15251d---gepumusovowubipeligav.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/75314624869.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pep3l3qjn40tshk54dtl7fov2s/vimowivipowalom.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/dowilon.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be670735a4b---3915134053.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210808041817.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/rerigefewexakepiweru.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/sidit.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/76392589579.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/25367343550.pdfIn PDF document text
    • http://mega.kz/media/upload/files/94925175248.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/zesozibur.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a566bcb24f7---tixutejopuriweligopajelo.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/43525067271.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210718_7FE8CDACC9D1B826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=that+place+eateryPDF 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_off0000be79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE79 10064 bytes
SHA-256: d507bb2655d4bacb8bdafb6d2f6f0aebf8f728951c8dc6ff9ad45064bfc6fa2a
font_01_sfnt_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 16436 bytes
SHA-256: 2958493e77b91d096a71dbb9bf3a9473c0b3d6224dbc4789c5ecede122a3954a

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