Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ae1096a31598b6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 02:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3d83fa797731fa8927755e26faf3ebc SHA-1: 651f30108e6919c4d58e4e9f704d0dd5dad5a372 SHA-256: f9ae1096a31598b605de2aa2886cd491a6ee9b29d97881c2fbaf657bf733b71d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=pair+ds4+with+android PDF link annotation
    • http://chiangmai-esc.net/user_img/files/laralipabewapegumivil.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/31948574894.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/47881012955.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/95253654d033274f2b987f1e51508bf6/97460279347.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/pivozonupowid.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecad0446b0---30977895232.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/wikonovesiviwe.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/420c1eb46c292ae3c7cb244f93a82f60/sajetatuxobelurim.pdfIn PDF document text
    • http://pk.mo/userfiles/file/sesojenumomub.pdfIn PDF document text
    • https://kimcert.com/E/file/ribexidegasusonalilegekaf.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/98566210301.pdfIn PDF document text
    • https://anakmeong.com/contents/files/6785524204.pdfIn PDF document text
    • https://wineart.online/userfiles/file/vosotomu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2c132d5198a3facf7e228ab96b3073fc/pesejutali.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/31164171703.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/9070073702.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330d10b8314---xezuwosemalin.pdfIn PDF document text
    • http://eichler-kammerer.de/44950147542.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/milapa.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/pinomumakosobo.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/53565498147.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/nefad.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/32456637818.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/90bbc0ed05c5904a81ea3defaa8f8270/37826700328.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/marovepazivur.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/14463100184.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_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 17040 bytes
SHA-256: 1d2c2ef701e3626b6ed598d23dd8bfcd54056915dcf1c489e0c23d420a347978
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 10332 bytes
SHA-256: 05ea734bdb37d8eaaebe0052fba8500f104a6929b511bbfda4a21ec0c98a45ed
font_02_sfnt_off00011bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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