Malicious PDF — malware analysis report

Static analysis result for SHA-256 0834d9736cc2e2d2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 13:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02f9ad18cb9eb9fdd88815359b05635e SHA-1: 223dbb8128e36401fe59b7189ed3667ddc46a2ad SHA-256: 0834d9736cc2e2d242da7122bd16a906763817695c89965178e0d8a6288bc089
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thepokewave.com/uploads/files/sagexonujafugetute.pdf In PDF document text
    • https://z87992961.com/upload/files/20210902130412.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/sabazaju.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/ximabilegujegegowa.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/dubefalusofudujinitojuf.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/83078426943.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/k6n0qofiituf916i667442b7le/rofikololoxe.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/pevazom.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140225926fbe---21641653239.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/52833587529.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/79443508308.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/xerabimunalekumobu.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/wugaboduf.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130d526c83fa---19800183725.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/1365bc38096a8639c9aeccdd83c5b827/bilaruwibevumumawomawimis.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/41048679762.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/ginabijobis.pdfIn PDF document text
    • https://loctra.net/userfiles/file/4356102296.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/duwazezujodasonalubi.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/18333904624.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/13844630091.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/jelip.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/56703488206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=venom+movie+tamilyogiPDF 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_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 10332 bytes
SHA-256: 32fc6b045644ff26ba2f47fe9dc31e6d452ef1f9f072296785370c8d640c62a0
font_01_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 18380 bytes
SHA-256: 0c6e98caf2bfcbc33d2110dbce01f0f673a5e6f60b972c8b498d04cf2195b8f2
font_02_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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