Malicious PDF — malware analysis report

Static analysis result for SHA-256 0437715096342ad9…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 16:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 552aca084d411a443ff391aabc113f77 SHA-1: 97b38b8496044c0d050655a0d9d1f7a6165dd99a SHA-256: 0437715096342ad9cfed4c3ad0cf1557a57da775b489a901d5db700efcd9a02e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and multiple external URIs, including one that explicitly mentions 'account live password reset windows 10'. Several URLs point to compromised CMS uploads or disposable hosting, indicating a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=account+live+password+reset+windows+10 PDF link annotation
    • http://hotspot-usa.com/js/upload/files/40840482220.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/wapifanumopu.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/wotorezozuzexat.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/53572359502.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8bbf74871656ab3a2bb637a3f0716f87/36158907814.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109121625112982.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/gobizuja.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161378db27c6d4---57203850288.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/bemepuvebivoben.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/bixipesutupuwivur.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/wodefiwab.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f7cb37b0f90b2ad6e319dbd042997c3d/8706632425.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/28092070977.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/96429181004.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16151b3fcf0967---22932239088.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/forunekemon.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/15375750230.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/piwokotuxajav.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/28821599571.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/mixijafenajevaju.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/50656035649.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/84547664544.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/rovekuz.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/39078880745.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/bewesaredule.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/nunatipowisibadin.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_off0000b5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 15556 bytes
SHA-256: ff32f20f27306632da84afc3521a6915db19b56e7b784d87f61764171337a861
font_02_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 10916 bytes
SHA-256: c3c42643fdc5a120230c30777da76f95dd20a9597b5a2d3a789cb713164beb3f

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