Malicious PDF — malware analysis report

Static analysis result for SHA-256 a398790de09e72f5…

MALICIOUS

PDF

95.4 KB Created: 2021-09-01 07:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26d65684261603b9ccffba9dcd1ab54b SHA-1: db00a065c815eb1f457b0357aa91e124523a2b2c SHA-256: a398790de09e72f5c09f91a94b863c54d538f3cc02d66bec042516987c0159f9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for phishing or SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns that leverage compromised CMS uploads. No scripts were extracted, but the presence of multiple suspicious URLs is a primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://fatamorgana.fr/uploads/assets/file/19423582533.pdf In PDF document text
    • http://businessvaluationapp.com//fck_files/file/rigaxodugone.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/20628507628.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/82759880642.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/fabow.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8cigsn55n559kqmn4jqveamnl/buvasoninaka.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/27379921500.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/58269071328.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/34389308006.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/riwexuletoviges.pdfIn PDF document text
    • https://huanghecables.com/d/files/fasikobo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116ac8447284---jajapaxetobopovigiwurelip.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/fevonoted.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/66866743337.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/fugazaletoxogudix.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/18771109295.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7d839a63ae3a7a90da1c2110316a267/deruwejafufinugeli.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071de76e9a84---temibasevesifaresexabako.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/99f9e4ec1cae04851e6e8184b7824b85/29446848221.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/81930936299.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078708150ef1---tawedenasekavin.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23432187f7---11704688822.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/31899875047.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/bewasanutozawukodobeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=static+gk+objective+questions+pdfPDF link annotation
    • 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_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 11396 bytes
SHA-256: abb4733282bd8c3a280e52872abaa37130cc37c8f74f717405ab34714b6db91f
font_01_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B03 19832 bytes
SHA-256: 1b845158c035339851b57a39e7450996311b56c37fca2e7e8c29ec87e3fcd3bd