Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da3df9709385c1d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 05:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79d81af32230df26f9743e888faf5a4f SHA-1: 5998a9b13cd5ebb77947feeda73fcf45d866805c SHA-256: 4da3df9709385c1da7c4663cda31df5c4782467ed2593eee3a62d85eb64bd182
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=opencv+android+studio+tutorial PDF link annotation
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614000543446e---67313667190.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/tasatiraje.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/22003041069.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/namubutujigapubozajopaz.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/lolekekepojix.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/sepufak.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/somex.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/47550337373.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/98198521592.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/fbf3d3bb28cfe86c808ffe398924f679/jelupazafemofajuro.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/xitedifegodev.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/44007775274.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/vokebak.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/24573623657.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/e01o3r29plhg8tvmg2knc6q4iq/37482036004.pdfIn PDF document text
    • http://unibox.lv/files/text/26390730630.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/gufetajeropipeb.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/zurerakuboturubewig.pdfIn PDF document text
    • http://ebus.cn/up_file/file/91851358750.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/20c9fe677a482396c0537dad56626ef3/23691653962.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/sexemigaminamov.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/25723845353.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/donipigidolivilisejolo.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/94842330653.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/gogeputuv.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/77254662924.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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 20172 bytes
SHA-256: 8a659cca6637e87682932505417b64e3a887165aed0ffbbffd49d9282f83df0a
font_02_sfnt_off00012a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8A 10696 bytes
SHA-256: 477f30bbc9d5af90d6881581b918026dc599c539e84bb2b2af514668c5af9e2c

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