Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47af8872a3bd173…

MALICIOUS

PDF

72.2 KB Created: 2021-09-03 10:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fbf051e97d0d148da177e7189afdebd9 SHA-1: 8befe52d977357ba969e6c38878fd362709feef8 SHA-256: c47af8872a3bd17306601ecb18a78a1db7f506c3b67f0529c5f9dcbc07b7f161
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://philabc.ru/uplcv?utm_term=edifice+watch+manual PDF link annotation
    • http://tarnava.eu/user_images/file/vuwonewigiwut.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/zasamatedovi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6396d73f---fotusasajigerojikid.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4c92056637a9305784d5f06ec7c649f4/51741369723.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tbb5bjj7v27gn1e1hnpgl3enkc/pivitipexenevu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8efed090d0---jevutiwezatemoreguxe.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/e4ncacptgevs3bdfj6ufvesvj7/babuvorulavigal.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/papikalarudipopepisulo.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/96474325501.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zetuwutunog.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/lixodumiwogi.pdfIn PDF document text
    • http://melvin.cz/data/faxesigoditajenotakozifa.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/197793844.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e60d5d61---67436886350.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/rijol.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/mubenafemita.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/74082370129.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/303c74c0c83754260d52ea590a4fb4dc/kesademiburonodilix.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/58510749045.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/a10ebd8bdcd4f8446ea288389fbe8ded/tusatesoguniluduxikenisur.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc03d538e0---wekovewefadasekexebu.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/76667487824.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607307299c10b---14036922387.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/6398073615.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090edff5edb8---pulusanade.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1eebb779---56450081964.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_off0000bb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5A 15616 bytes
SHA-256: d4eaecc179716f72fb90ddff466b94aea6f4f23ec7a2f4397704198527e4520a
font_01_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 10524 bytes
SHA-256: 1a42268500ea87dd80cfe88f8c6c25c2abece5e68b4410d6df02ff42bf815943
font_02_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1