Malicious PDF — malware analysis report

Static analysis result for SHA-256 e962b6657d3a57cc…

MALICIOUS

PDF

88.9 KB Created: 2021-09-23 05:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdfe8a04da53d2c9830a483ed4f29093 SHA-1: 23fbb7513c2f45b9628277e577a79da6aa194a01 SHA-256: e962b6657d3a57ccbb509dcc77e106564928511ded34e7bfe3a06637a793c4f7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised CMS uploads. Heuristics indicate this is a link farm designed to redirect users, consistent with phishing or malware distribution tactics. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=best+photo+editing+app+in+android PDF link annotation
    • http://nusratali.com/userfiles/files/kigasut.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613de49110dd0---pukutiza.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/2892971549.pdfIn PDF document text
    • http://newshop.jp/archive/file/fawexibukojujiraf.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/88715970166.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/kavalirunipugokemituseb.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/piveledexibe.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/fubikadaligitawefabasuw.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/121441585.pdfIn PDF document text
    • http://holzbau-napetschnig.at/31970677174.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161396f4600cf2---99149145397.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/poxulafogasajaze.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/zukosenivenas.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/xipaxutunevolajosoluxad.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/bitaralobewizelut.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/zewonoda.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614901c18afba---riboxibijekalasurojako.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/87872656507.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/73089589778.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ec99fcb76436f0cc56a155f527cb0c97/4950787000.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142f4714b2b6---61310579301.pdfIn PDF document text
    • https://raljob.com/userfiles/file/18097923438.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/wowekuxajoburun.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/xumefugemaxafe.pdfIn PDF document text
    • 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_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 10676 bytes
SHA-256: 4ff7db8a28d6610dad15bae89c1eb32d4449ac9917ba5e3268d7784b2ab8d5f0
font_02_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 18192 bytes
SHA-256: 34344aca91956b3f13eb1eb5b1e1539c12b230199c093185da0938f6ff6bbf18

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