Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d65edcaa408b496…

MALICIOUS

PDF

76.9 KB Created: 2021-09-24 06:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 54e73cc621053d2bf762c0b36c2e089f SHA-1: ab00e3abeca629ad0937303f75ce0105dbff7233 SHA-256: 8d65edcaa408b496723a9b9897706ed3dd9946246f583312d8af117014a7a1f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF containing embedded JavaScript and a large number of external URIs. Several heuristics indicate that these URIs form a link farm, with some hosted on compromised WordPress sites and others on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to deceive users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://www.puskinas.lt/ckfinder/userfiles/files/62907911812.pdf In PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/98275334406.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b4e4affef---40216877169.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/binopimineniwegaga.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/vovatetexiradofa.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6758400b1b52bb5d6f7f9daeef40acd6/dadure.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/57020415562.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/34487657309.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/99810234545.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/denenumamipafa.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/30300b19d39c2af486d8fa413e278fd9/43106663798.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a65aaaad3---67482021216.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/fujewuwetotokodozole.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/62020812023.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/dewad.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf19131835---fisadiramanesetiwebudifob.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/366f357de5e070b426c5c009a6e8c6e2/kokawamenewipagenezijok.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/xabexu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/milaniraweje.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/46755476666.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/ranarivolule.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/52631531647.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9640ee7737299f636017f27fc1cc00a0/pupami.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/78247111562.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/67490632942.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/79298341732.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e763e8ff3e---livuzubumosafedifanejipal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=recuva+for+androidPDF link annotation
    • 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_off0000c4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C9 19416 bytes
SHA-256: 161f7e93a0308dbbae894711f011b2ebf12baa8403bd92dce9adb2c9ff57d2a9
font_01_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 10368 bytes
SHA-256: 09ae98ca3964734279420bcd46ec8348797d3bbbda0fc88e3f8fc3dba8386a73

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