Malicious PDF — malware analysis report

Static analysis result for SHA-256 e536a5cc348598ef…

MALICIOUS

PDF

134.3 KB Created: 2021-08-27 04:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d264af996c6099b05e61265e245830d SHA-1: fa2b38083b65f5d33615590a3d78acde57e39ac3 SHA-256: e536a5cc348598ef38190a8d20fc915c002afc372eed28f7bfcf3ec8d4c5ae20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=how+long+to+grow+avocado+from+seed PDF link annotation
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/3886216626.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/digagapugukavakogelegili.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b4878c3ba---89002405045.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b6abe6f02---tolimutab.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/97780524604.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/56101757328.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gizumaz.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c1d6b3e748ff88f154ebbd4c26eecf9d/pimedogesepexupoxeke.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/34810375918.pdfIn PDF document text
    • https://csodamalom.hu/files/files/24552303551.pdfIn PDF document text
    • http://expresskaliski.info/file/mogiruwazisi.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/64799912939.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/sodeb.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dfaf18b0813---kajutife.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/nerikabudemavademek.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/dusuposikeliburig.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/lejina.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/fevalaboxuposonoxedijosi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c860a8653---jefapapuseziki.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/ginufeg.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd333914c22---wibobogetama.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/konotiramusesavuvaroza.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/18031f7bda3009391c65a810ea150377/zibevifimilivekeda.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a436dfba359---28651554191.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/sutewidinedixutemu.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/ditojuragula.pdfIn PDF document text
    • https://izometal.net/mm/file/11449739150.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_off0001a9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9C0 10872 bytes
SHA-256: 95369edbcd792a79b90064611fa86bfe7411fbf122965061193d97a3372d2c7e
font_01_sfnt_off0001c2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2BF 17888 bytes
SHA-256: 5cd9677a263253769b2dd36382a6b80286c4337f2f685fd90a069e75a8afd37f
font_02_sfnt_off0001f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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