Malicious PDF — malware analysis report

Static analysis result for SHA-256 7236af37e06c126a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-01 06:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9141e976aceac142f41be94274bb12eb SHA-1: d97425ce8d6699d3bf2657cbf52ed25a82dfad74 SHA-256: 7236af37e06c126ab9fe8f9dd525c11efef8cf5a1897d062b96d7ece3d5bbba9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://wastran.ru/uplcv?utm_term=normal+ldl+level+in+blood PDF link annotation
    • http://phuongdonggolf.vn/app/webroot/uploads/files/17433891665.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/tojipexanitepugarur.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/safonasofolojugokesis.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/8270776584.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/99049640192.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/xegibozapagago.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f98b1210f22---gobarolivinizogaxunijo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/24958651008.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/3d4d898e5637512d0439b29b91f1bf86/fovokobi.pdfIn PDF document text
    • http://erdbau-rauch.at/220750154.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160721da7bac91---getizilafizokodazel.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909966e804d---dokenugofobebuzepegixa.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9587c7169---gudutuladipoxikaxaxiwa.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/jaxuzik.pdfIn PDF document text
    • https://mavibusiness.it/file/22188804351.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f70a4aec9---logevirabedis.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/xisibuzirozewovapowiwu.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1625315346.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/sozikuboferepakeza.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af94956171c---xetavumaw.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/40763640417.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/vegujemojawolaruw.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/dufobasivuwuvasatu.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210513160122015292pyz9oj.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/63733260533.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/bowizumefogedi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b1db266be75b7b09dec2d1161b75b51c/vavepew.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/neditevuletoz.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_off0000b9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F7 10328 bytes
SHA-256: d78f5138d1275238e31765c780e8a7e712501bd84b73a333c8de510d708d804e
font_01_sfnt_off0000d124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 14896 bytes
SHA-256: 99893f155fb8984f6c0dbe9c37209e63c2c64789853c75e85ce98c8282b98741

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