Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e181645ba107a5c…

MALICIOUS

PDF

80.7 KB Created: 2021-08-19 03:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 818afdb7956d03be1c14dbf143cc06ff SHA-1: f8d80de59cb5d8130bfb3ff3bf7cee238cbc7dbb SHA-256: 8e181645ba107a5c50fef4a3d92751f31d02f38b02a80a5ad01fa733f95f08dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=whats+a+good+girl+group+name PDF link annotation
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/milulapodegiwuwulef.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/cefb0c32c521d421091150074d391e98/popezikikag.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/0d340bdd2317dcd8af429860706ff20d/lemuwix.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/47417172232.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cef6ff31af8ec53e7f55c0686c43795/xitis.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/92189230333.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fh56h1o50gfgfbrfs2lb5et3g/zorizanod.pdfIn PDF document text
    • http://abworder.com/uploads/files/8369056073.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/widinenonodef.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/wojolenekuresasuneru.pdfIn PDF document text
    • https://ikima.fr/uploads/file/xasewamasorubuse.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/74310355985.pdfIn PDF document text
    • http://scro.ru/pic/file/muxidokigirikaxir.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af91997a2ec---dogolanumara.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/98355508089.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/16378213744.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1323b45c---84598076081.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cc32dcff935355c23a10a3f8fba3da1d/70442578688.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/17988055591.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b794c8f2e8c---88777574839.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/17958802608.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850b6640c72---62627960898.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/lodoxobilesove.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/a00677aa5d636089e63560b8247f0ce5/dudolixadipepiterapisuzo.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/nugazo.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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 16884 bytes
SHA-256: 26a1487114786989e70d222cb084e95a6714474b1f4b9527a8e691f4349afa86
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 10932 bytes
SHA-256: b33ff9171a6b7e80c28d1dde16a9cc64336492b3110b7a67987afb9dde035bce

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