Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad9fd1ca9e0e809…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 11:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc9b937b2c64e46f762b44dd6bbf60ee SHA-1: e46098b5e500d775b8da445a6fb05cd75d790e3c SHA-256: aad9fd1ca9e0e80944dbc8acec8a833a2b322e08a5b555e8a1ef15f26ae74f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=recuperar+datos+android+memoria+interna', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=recuperar+datos+android+memoria+interna PDF link annotation
    • https://ccskin.com/geektic/files/86370642516.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/27116805425.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/zesezavejevuki.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/borej.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/busoxajij.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/telenusoxanivo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/87127d5954d72ea11d17ba28d0e265a4/91886984709.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/patumugasid.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/kigazo.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/rubugaxisizukitovarika.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/30694443847.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/dipeledajijukeb.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/kukomi.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613604c718fc1---xivugufezaku.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135dda8f0b37---69117000782.pdfIn PDF document text
    • http://riph.pl/userfiles/file/legejabaja.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/12501077192.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065b31bb19---vuligenobafubonubom.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/gitinegaxu.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/20342979698.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/98974381505.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e28b2ab16---vilufizigunuze.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_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 10776 bytes
SHA-256: d95f3bbf5ee38e41710c29e2e4844a430b8d058562d2bd725c1d7415c7f5119f
font_01_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 16900 bytes
SHA-256: e9722c4370111ecd579b2765a1d09538ce9639bbc8196c4f86bc79da627e5587