Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff698bbb3fbdedbb…

MALICIOUS

PDF

90.3 KB Created: 2021-08-20 21:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 572a10eae9b70a5aa9f847a0971c21c0 SHA-1: aaf0df99b5ab5f61fb7c08c8562f0ab85a9eed16 SHA-256: ff698bbb3fbdedbb252d2a15f764a731872ff003f73a4951f061b98b166f1a1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that likely lead to malicious websites or further payloads. The presence of multiple compromised CMS upload links and SEO-focused disposable hosting suggests an attempt to obscure the true malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=best+budget+tws+earbuds+2019+india PDF link annotation
    • http://motocams.cz/ckfinder/userfiles/files/kefidativumifejaxaloxop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608324f7582ce---11398272105.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/6113ea6a7a9f04562a564fe9e6614644.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52515502534.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/kutedo.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/nuburejimubim.pdfIn PDF document text
    • https://electroagro.es/pub/files/mamuxowanikopuxotuvokiwuw.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/18884392522.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfec2359cff---vapejaxepex.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/76051268735.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160763c87b7b33---99228189385.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d03c836c4---45776300188.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/sowelofulib.pdfIn PDF document text
    • https://synersys.fr/contenu/file/voliworupatufozupolu.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/mtgpf2t1mntitgr9d8acu10t37/91214926577.pdfIn PDF document text
    • https://ever-progress.com/upload/files/31109920579.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/vanuxukugukum.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/112440493.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/77518275588.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/tuwizow.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d9c927dbf458ce1bb6a31cc8bda8b014/79975043928.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/gikelijilamubigazev.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b608aa458ad---miloresuvipiloj.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/bigomeviwuto.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/34648640726.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 11096 bytes
SHA-256: 9898fc1339f06fb48fc3da8b2d1d5f5a053fc9a5c1d456f8fe70dbd292797cf1
font_02_sfnt_off0001166a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166A 17360 bytes
SHA-256: 1ac8d797567f61a8eec7ff45ce72531637bcb9bb6452d6130237e83ea2604169
font_03_sfnt_off000143f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F7 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58

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