Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee45722ba71ae1bd…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 07:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc47a9fe073d24ba0004196616a735eb SHA-1: 22507a50c12e806b84cc75235fb19ae980cdbdf7 SHA-256: ee45722ba71ae1bd3408c618294a88a2aed21fbb26ae9dfb78cef79536f8777c
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. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://upnbkk.com/file_media/file_image/file/nowew.pdf In PDF document text
    • https://benqmusicworkshop.com/fupload/file/sonoza.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/88152923007.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fe1d4718b3fbbe4e9963d1bbb61f76ab/77587069622.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/12763973465.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/radanaxagejefomuso.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/21941746444.pdfIn PDF document text
    • http://steinemann-ag.ru/rovuwefewuramifup.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/13753711745.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/soneweduwosominenivimuwo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6bf4499aec3121327c795a9910fccd9a/44929228542.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf2a940fb---woriduvobitov.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/21355522038.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/zutularujumexokikukimi.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/maludawojedivubozaw.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/topusitabisixa.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/24938250043.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5ptolppb2qq7ifse475v3ha1nm/25003357854.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/jipotuluvure.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b1a2bc52d8cea4aec4e6233be96ea99f/29527257267.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/tokopapakosiledago.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/rajekamavirobofurewevone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=just+friends+2018+full+movie+with+english+subtitlesPDF 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_off0000af88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF88 11524 bytes
SHA-256: 889e5f92f9515545ab179239a852d41c731a5613a3dc0dc79c3500f5db6e538d
font_01_sfnt_off0000ca93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 16352 bytes
SHA-256: 164f77ff677058a8d0715707cbf38702e598ff35225b9314949e4d7081452c31

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