Malicious PDF — malware analysis report

Static analysis result for SHA-256 5960f8b4886f18fe…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 13:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00adb82e023d4a2648e012905c8c73a2 SHA-1: 71cde2cf370c5f1ba188a5443f28e66ec9d8185d SHA-256: 5960f8b4886f18fe71a4960b73218800a5408029afab5e9d6ddefdaed6dc0260
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://kalmi.ru/upfiles/files/daputatosug.pdf In PDF document text
    • https://baigiangtoanhoc.com/upload/files/wopitizewilosexidewevef.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/bawid.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8f9e619c---defazeronofupusifomap.pdfIn PDF document text
    • https://italvaping.com/file/28352819614.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f5e373171b---36415814192.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/vorosimilajulafufepomal.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a78878a4e7---xakowijeberanariborivomu.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/3853383401.pdfIn PDF document text
    • https://loyd.rs/images/file/14103010065.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c318d4f3---46349033553.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742c3b76d9b---76859287240.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/wetokusawopuxapigo.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/nejexew.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/73164829271.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/13598907660.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607006ea14e07---mugopavopezibodoja.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/pajumojeli.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f60a0a8b---dexunituwuzu.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/72801254965.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/jugujozi.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/dagoxutodovap.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/dexoguxivagajoxudire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=using+worksheet+functions+in+vba+codePDF 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_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 18984 bytes
SHA-256: 606a2358008d16e435494af642178ed808538e05513332adbffbb76064c4be97
font_01_sfnt_off00011ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BD 11200 bytes
SHA-256: 62b624f497cbf35e34e4ef9fb94ae62e8e63c40e81e6735263fd563b83110558

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