Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b184990ef196b06…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 05:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43a0ffde0a28d164614031828f49293e SHA-1: 0d23f1b88c3549b361af81d15843e7fd5fbc17e7 SHA-256: 9b184990ef196b06a084d4bdb166bc8955fa8dd1d1a9643b2a29873ae086456f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to redirect users to malicious content. No scripts were extracted, but the presence of external links and the 'link farm' heuristic strongly suggest an intent to redirect users to potentially harmful sites.

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://infrive.ru/uplcv?utm_term=audio+recording+in+android+phone PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327a9569684---komisilirijenejakedapiga.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/gozetejez.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/55100963506.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/2337122337.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/kumipirululumuwatuna.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/26107914326.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/xubimozatukipetedobasadu.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/52708895555.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b04e6df7e9---95788557460.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/dogifewomamazuv.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/tugutogiwudegexiw.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/76661723597.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/54841204010.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/91859644117.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/2982562679.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/nadadikeniwofilovewa.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/pudivewawebozoxisisedu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b547e6b273---wizezigaruriregik.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161409ad63ae1a---55891611166.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bd3217b69ddb567815e3e76b2ba72d01/22501265300.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/nebixazenuti.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/wunutara.pdfIn 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://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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 18372 bytes
SHA-256: 3cc52371f3b5795a944474dd90b41690342a8e3e08473c9597a2576b308c3c97
font_01_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 10560 bytes
SHA-256: dcd6967e53422e4f06c42ea48a8c6f14e29a90d0a51e363c8ccf608dd228c246
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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