Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4c22cf84187dea…

MALICIOUS

PDF

85.3 KB Created: 2021-06-29 21:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 267e02d25827cb1bb07190cbcd9b7ce1 SHA-1: 8f4a6a19378b7f38683fbefea2541c0d1304125e SHA-256: ef4c22cf84187dea769d9db797e1bcf1efeca6d4761c84f5e1915521d6a2bc8d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous potentially compromised or disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's structure and embedded URLs suggest an attempt to host malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://abugfreemind.com/userfiles/file/78714644464.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e72eb56c---savepidarov.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/nimediweleva.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/76daa31bb87a6b4a3db22b33de81bbbe/68738783173.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/sewew.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bec685213ce---26532316094.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/sixoputanuniwizexixisawes.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/14700015654.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/30a1eac8a933eeeb3d5d74427eedbcca/veribegavepabef.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/nejis.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6358a8e69---tepefule.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0to202d4v0sjl7t1f8t4429ufo/pogavab.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/64290901721.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/901bf17632e74c9c0d3c68afe86175b3/2052235714.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/rakomedakifodo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acef40de671---surujomopewol.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pigatagorowawuxuzabasuwuf.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/60728706854.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/a7d3d92e2b223c0b262924bd26d781e2/8853313698.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/libuwujobagetag.pdfIn PDF document text
    • http://whatdwellswithin.com/file/57624179430.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/narigigip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=read+array+from+file+javaPDF 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_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 17588 bytes
SHA-256: 01c8fff5d28184a7bd6450dded741b01f962adc22248851e04cbd9a93d171329
font_01_sfnt_off00011856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11856 10500 bytes
SHA-256: 1786aceba8bc452c2da9392454589ec9dfb2064501c3f1259eee6de24eb068f8
font_02_sfnt_off00013025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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