Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdfbfd413b1ae68…

MALICIOUS

PDF

94.1 KB Created: 2021-06-17 07:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5cf800cd33a514e133211e008f21b83e SHA-1: ba9183a521b2560180e90d2e576d3905883815d0 SHA-256: cfdfbfd413b1ae681f91340c76937791ca57ecd1369826adfce4db6453d57f7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://laborke.ru/uplcv?utm_term=watch+frozen+2+putlocker PDF link annotation
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/e4907c7c13af71aaedaead1c4fca072e/42919737255.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f17ba222---28529869130.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/juxuwojowe.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/79809791316.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881bfb6a395---58944371731.pdfIn PDF document text
    • http://ankarapianofestival.com/userfiles/file/dezisevufibisupimebozil.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c0cd84734---72120749056.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/17735995577.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6093930f93---4814174033.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/94312662174.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/lusezitazejurupekerozij.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10641393c---welegubu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/14481129366.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/32692237701.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/rodegitoruwadepeduzediz.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/zekogasalosesakojuteluri.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160843cfb23a33---jaletewijobas.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/maridajefomuri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 4780 bytes
SHA-256: 2bc8a5e769776b4bf365de7503d889b94cb700b55ddabeed2670288ba893826d
font_01_sfnt_off0001305d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305D 5184 bytes
SHA-256: a71e6e2a62ff7a3d5c2d95e6a6211a53cb12f67d47fe8237e35cf00c869d9f87
font_02_sfnt_off00014219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14219 12616 bytes
SHA-256: 7527339efc6af3958564a38e110ebf63c6a002d06669063b86e989facd9848ff