Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b7c5397e436cc9…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 17:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cc8aff9e442b30f92775f6eae7342395 SHA-1: f015cf081bb9a98ac431f7dfda60357167f8ea34 SHA-256: 54b7c5397e436cc9e81c15a8d504c587adca3e3f16d6956cc5272b014a106b05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other hosting, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://laborke.ru/uplcv?utm_term=off+my+face PDF link annotation
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc55109c0---24890961233.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210629_223015.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9dd9e1e7---8045301834.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a9237e29f---lobamaparekepadipa.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/28107a3c05d0bd48de0b1566dbbd4b9b/visibikagoxe.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2baae259922b53fae697a52163892bca/tukikozoji.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/96197855379.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4vah6diufuv0g478rqeli0761a/77299555458.pdfIn PDF document text
    • http://mesterek.net/tmp/kesugamonelepelugawen.pdfIn PDF document text
    • https://wita.lt/images/files/1192092725.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b76c007d7a---wapowewonumoborofit.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/58305248699.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/iceccua8magc11m1ftv8g8bdbl/48313040250.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a0ffd8975c8dc55fdc96806b51bc4e4a/22838404338.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/83358330620.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b88b89f8---10082334009.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/96102386504.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608354b032c26---xunin.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/gokudikatufowutozus.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/68gbs1hbvia3sca43de5okbpct/16337608120.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/92166203853.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_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 18040 bytes
SHA-256: 74514579271f2f44d83062d34a005f404117164a661fca807b9b723f174318d9
font_01_sfnt_off00012257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 9908 bytes
SHA-256: f6fc1060808fae0599b6edcf54a4353e5ab6f31f40a4ab426dd4e48e9b05bcba
font_02_sfnt_off0001384d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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