Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfbac5d0e6d79ba…

MALICIOUS

PDF

108.1 KB Created: 2021-09-04 08:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87a2a98ec8de483504860861cd20cdb6 SHA-1: aee66c9155c64335d175974bceb176132113223e SHA-256: cbfbac5d0e6d79baf5c560f86662e3c5890a2868d8f60c014c8d5582e674e3a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a network of links for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://alpha-cp.com/userfiles/file/59740403830.pdf In PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/57853736904.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lgtt2lp72smsr6pan6c6rhqc15/3574263023.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/41694276036.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/701e260b5273d42b626c042bfc830eec/26612699941.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/nitivexudekaloros.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/94927812797.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981f69d79db---8971477524.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/17560432683.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/kixenelunid.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15428882864.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/tixusafizekejexafibo.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/10173757935.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7da6667780d08c2b2e1aae4a0cb2ca65/38929231673.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160919f060a61e---pizaji.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/16500008668.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/59102024283.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770fa93638a---67119138693.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/45804549267.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/sagilamidoxivakut.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ka0e9p3bp9gmbsdap2u5nhctb5/naxusefekuraribujet.pdfIn PDF document text
    • https://primer-spb.ru/files/files/25907609450.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/80824958142.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae1252e27d---23756465887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=metodo+historico+critico+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_off0001401e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401E 19148 bytes
SHA-256: c39a248421edad0a71d7ca124d665538c8da06e2759d1c73c213dbe16a6ce29a
font_01_sfnt_off000172ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AE1 10400 bytes
SHA-256: 74abbc62ecd0f55e4842a5630adacb1e0b43937e083f1c83f905a57614bd5288

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