Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea859405eb3dad61…

MALICIOUS

PDF

73.4 KB Created: 2021-10-01 04:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28e6a8278176cd6acaec78760cea5892 SHA-1: 3e51578e3b1ed9ee1788aff0375e16f0a140466d SHA-256: ea859405eb3dad618f674877a8137395823519b74480e2464868dfe032e82ae2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to lead users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://medvor.ru/uplcv?utm_term=frank+m+white+fluid+mechanics+solutions+7th+edition PDF link annotation
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b744609852ef46a617e4efbbeb843a1b/31811138214.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/77411262982.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/88028386472.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/toluturilidumulix.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/fibatonotolowala.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/57335713313.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/3646981884.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/rizurekupe.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/10094576789.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/tabetaguwev.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/xetilefebovifexafuviwomit.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/kiganevitujumad.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613be46113b8f---27930885350.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/gadafokojikasuviwid.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/11247e0afe3d5b315883423ce26d86ac/1260203076.pdfIn PDF document text
    • http://mfcpavpos.ru/file/zojuvukudutasu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/kodefonizanam.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/maxakobamifuwa.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/20755244367.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/pewiletezev.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/83727114036.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/vodavidogi.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210906171032_1446183763.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/ledusozinunorazizefufam.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/bitikizik.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///zikoruvibinagizufezipir.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_off0000b92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92C 17376 bytes
SHA-256: 45b915e287c8f3ebe4e5576f3d53c4b4597019e8288b7b97924168e2b2e840a5
font_01_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 11044 bytes
SHA-256: d509ff90b50a97ab9e28bf3c5b82e5119049c992608e487ee8d4fd20ec300f6b
font_02_sfnt_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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