Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2ea3c95efc7312…

MALICIOUS

PDF

69.5 KB Created: 2021-09-02 13:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f377c340192aaff614c31f1998cab43 SHA-1: 5bb6bdf06d83aa0e92f593ee49b84fa35c33ca55 SHA-256: 2b2ea3c95efc7312f32d48e54c66de1d4958b99cab0e3af76b4fd11bd757d340
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external PDF files hosted on compromised CMS platforms and disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing campaign designed to download further payloads or collect credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://branchennachweis.eu/userfiles/file/xefutuk.pdf In PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d66b08c9fb462dd66b5b595889c3a7d1/20236103151.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0ll2o7j19g61brt2qldpe6vgvn/musujetilufuderinafi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608197ffe260c---dapijemovam.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/78474491269.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/v6jibsnvjptr2jfcegissfpb7s/fukolekuvamodigelabu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/48119885688.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/gukefasujisub.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f52587323---pigidoxowarujojemigip.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/wexaniluxisatixemogo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/43469213402.pdfIn PDF document text
    • http://jar-ted.pl/file/rorure.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0500d9e72b020b813d1cff00dc1ed350/zuvokajesasujilesizen.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/topizoxivuzobigemu.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/69403226625.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b9c34f632685ad1a769e57dbbf9468cd/xusafelosofixefit.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/jukajusolarageravib.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/finaw.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e279e4097---sisifenozexudoro.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/sonufevujanatezin.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d072024e0a---74927863756.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b3be318a67d5a5417bd533d57fc58fd/96168661839.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/faefbbe6ff356f1ad704a4b731c294a4/68494720633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=haese+mathematics+hl+third+edition+pdfPDF 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_off0000b3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 14356 bytes
SHA-256: efd63a35a7b4331cd5e8e90e27c8e12a422a1ca0ecf1d0a05f5ef64e3e832534
font_02_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 10876 bytes
SHA-256: 611c2aefee1c012d1a3a4030e400779728d645d182c7674d1dd47d8b0bdcf0d9

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