Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccf323bc88f07f3…

MALICIOUS

PDF

95.8 KB Created: 2021-08-17 14:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2162e29db247a2d802962d22707bfb6d SHA-1: ac5a8d2b2f0aeaca3698379434224c337f05a4f9 SHA-256: 6ccf323bc88f07f3ec337213f3fdb29259f1de2fedb27181d2e3c5b081bf10c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=teoria+de+carl+gustav+jung+sobre+la+personalidad+pdf PDF link annotation
    • http://onnetsolution.in/userfiles/file/dotixupogevudepos.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a568fddf6f8---19853339843.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/gurumizudetivogamiger.pdfIn PDF document text
    • https://tcremich.lu/files/files/57184839464.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/25635159088.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2809570067---85868314498.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v82mlh86gt54bjns7ctkag21n4/gezolawax.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/folemoboxuwilimilugop.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c784605f---guwud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f4e11b35---tenalebepakotapaleka.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/86156245519.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/vovaf.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/84331966920.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e782aebb57362d1014e219e2a08c475a/zogulutaj.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca347d6dd6---tagojipufebosuvanidisaxi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca12a14e3---nusufufage.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/pinaxuwazotexumuteninu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/scvjpav6jlsue5l5gr2pvosebq/56203534768.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0e89e7d55aafc3559999d7f3c1e3f197/wagobakawitazi.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/pofefepup.pdfIn PDF document text
    • http://faradbox.pl/files/file/fijuziruwulumebuvipu.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/66617653551.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_off00010d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D59 11192 bytes
SHA-256: d6ffa00c17e4523d3b329262ca01532199b80696cfc8062d3caf632c6a9891b6
font_01_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 18548 bytes
SHA-256: 52c5559e428dca3e3ffe3c77d33bbe51f5a892f033fad3348132f31cced3291e
font_02_sfnt_off000156ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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