Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd0d59cf6bdfd32…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 18:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f99bef484c631804256b60ddfefe334 SHA-1: e67d4e431e53714f231ad85e051ad1c9e2c3d3bc SHA-256: bdd0d59cf6bdfd32e09a4abf40013683491b7f9668be840c4fa716a1976c8c89
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack vector appears to be users being tricked into opening this document, likely via spearphishing, which then leads them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aaf5465b9---batobukadiz.pdf In PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73f221dc7---fivafizutovezonofonakoxo.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/83529635290.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/wepofopiwewemonupujivades.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/15883130789.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/bimoverub.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/zuril.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/41000871298.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/wevikuxesaten.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/fojibagafo.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/hqm0hb550bvso1174of8fvf55d/bididum.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6e69ec93---54583972166.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9395c18132fb4a67a5e3ef6968ab9d84/60838230381.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/bugebagez.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/08e642d78983c455005df2c39c965459/87573832928.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/32329822612.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/68355454686.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/98e2bdbae3bf49f73741723aedcb1194/28108424638.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/takezimobi.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/podixi.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/46319741966.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/85436360291.pdfIn PDF document text
    • http://greenbrier101.com/userimages/rezugejedekijasoxok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=diploma+certificate+template+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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 10508 bytes
SHA-256: ad553d25f408d32311411cd4ac9319afa46a43d94ea7a6d42deb7808c23d0de5
font_02_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 16412 bytes
SHA-256: ab98cc4788f94cd4efb552af2e1abd5ad39a5432db79fefb86cf6483cd133553

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