Malicious PDF — malware analysis report

Static analysis result for SHA-256 94de43c6cfdf6054…

MALICIOUS

PDF

88.7 KB Created: 2021-08-07 01:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd014f492e3f256b3f96d58d1f54e8bc SHA-1: 6b23fc53f70f54a50e95f340288ee3992996c341 SHA-256: 94de43c6cfdf6054533cb1c259b95c643f3c5dd68e7d8553dea28925de22aae1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The primary function appears to be directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/uplcv?utm_term=what+is+the+latest+samsung+tv+firmware PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b72f94c5234---memuvabevabadefufiwufa.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/19934711595.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/67212825930e4f697be7a14ae567ccf9/parexawoliduxumidam.pdfIn PDF document text
    • http://haworthclassof73.com/clients/73472/File/sikipazijilikapa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sirebonilawomedu.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/84379870104.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/5ff448c4a57770088b29b5aaf6e4b425/20326429532.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4d450c71129dc060c774c64c72c0c14e/zifimofumiteruguziwuwe.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/405519f2fc9abe8fe0353979878985a3/parojusimom.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///xexavisurekupexadibun.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/92022630503.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/31530692036.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210805224731333.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/60483855449.pdfIn PDF document text
    • https://migger.dk/userimages/file/50929070529.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/abpu33u2ond6b0mu5ptac290vm/67572887985.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/617aa6b3e17294ff003312f16f497d03/57451655602.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/90f133023a2b1a9533be76ac1a72a7bf/15074814838.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/628054be93a09f23f3a66192e494a684/zekawozedukuwoserapomul.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079a66467921---51758854421.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/furavesawili.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/dokugekiruwarodesopizebul.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_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 10788 bytes
SHA-256: d435c88470df14031a8307da85cfd6bcf5b2a385c21be0199fd4e739f189a37c
font_01_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 18248 bytes
SHA-256: c50d65e30823a1a3c08d7df18cf0a8ebe5e59e33db354bd27028c36759498ff7
font_02_sfnt_off00013b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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