Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0026f6362e94b5d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 13:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7abbc0352ce0704a5f561c42eca14c51 SHA-1: b4cf26dc75b398f2fcdbbbbaf5acda63e50b6b94 SHA-256: a0026f6362e94b5d07552bb9dae178b1c7acfc1fe24c5a6273bf72abd0c8bacd
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to malicious sites. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting the PDF is designed to lure users to potentially harmful external resources. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://delta-relay.be/userfiles/file/besisul.pdf In PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/20056947366.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/kuzododijodozetopawebab.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/mojekotixorizare.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109070945156694.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/74372790370.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/luresid.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/jegotinukitinedut.pdfIn PDF document text
    • https://nomortiga.com/contents/files/86923436294.pdfIn PDF document text
    • http://szcftz.com/upload/8934718374.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/94616535652.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/15072525520.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/zeguri.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed3e672ff1---86822684736.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/xebaxibazajuvujupebenug.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/33139899188.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/20700535724.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4acda6a5---taxomegabiw.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c73d2d44f5---56340498408.pdfIn PDF document text
    • http://imbirimbir.ru/files/tefolonegikuzi.pdfIn PDF document text
    • http://placc.info/up_image/72654773079.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/nexetavibufawaloxewiwu.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/85446369433.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/4570839811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pantalla+tactil+no+responde+androidPDF 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_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 18952 bytes
SHA-256: c5281890c7b02b109e0e945523f00df6892e8acfd952e132f21b69488a1f25ff
font_01_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 10508 bytes
SHA-256: 66aa8503945b9529727ec4b59b0788e33ac0f587dd6746eddd3f74591a9275dd

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