Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f479daa3994466…

MALICIOUS

PDF

95.3 KB Created: 2021-07-03 17:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6eae162d2454186c927d86db81c0a0e8 SHA-1: 519c59c4133e0f92ee75c14b43d436b424919f49 SHA-256: 46f479daa3994466cef2ccd6e3078450cea575528fb9a06dc6d3361a7d0d8bf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs indicate an attempt to redirect users to potentially malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8bbb1a602---fomaxu.pdf In PDF document text
    • https://condominiovillage.com/userfiles/file/wezonorupufedatiwuporese.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/wujow.pdfIn PDF document text
    • https://zzhqhi.com/d/files/38269258398.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/nukigo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa16f21f8---48971156296.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/worek.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160879e7bb3b53---repevedusejolunev.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f0e93613f4ab3d495aac9759e20449c7/32387617933.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/batenidus.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/mezuvovikuxogazoxofip.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/peruzijubu.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/wetipisise.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0591e6baff---12366573411.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/76707913187.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3016bf3c89---rovidegi.pdfIn PDF document text
    • http://voijin.com/userfiles/files/83969776513.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/boluwuzoduxusun.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9c2f94bdb---zafemufedosi.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///40503301413.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/13658444633.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083bc13d0c7b---92943999858.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/85a1e20215fec81920a2b051147e636c/67842426180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=math+word+problems+with+solutions+and+answers+for+grade+6+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_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 11432 bytes
SHA-256: 4fbc7f79c8cbfd43131c7380e6be16094f2fe7007dd1fb0130e18f6dd724cdfe
font_02_sfnt_off00014102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14102 17660 bytes
SHA-256: 2c7fb47b0e4d7ef43fb5893d0f6e41dc5b17483b5953bb4accaabf3db2a8e621

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