Malicious PDF — malware analysis report

Static analysis result for SHA-256 89df8f4039b9ca6e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 20:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba0ec0ad3cd2909a4ee885aab8718b82 SHA-1: 1f8609885af2967ee19730e8371ce77a6b20d763 SHA-256: 89df8f4039b9ca6e6eafff39ca576accc14c9eab1c3a66814d41aebc23d78701
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086d85181b19---fanigeliz.pdf In PDF document text
    • https://hyosungulf.com/uploads/file/jopupakejobemu.pdfIn PDF document text
    • http://riceart.ir/basefile/files/finatorurutekorutuseruxi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073095c17908---debovusewutuwetosopefuwi.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/20180229912.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/wokowodesilijatagolu.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/39d9f8b3cef649dc181e851639289e7d/pimujipefoto.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/sokadexitajoxebomagosoguw.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/vejizidoxogotu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/pn6s33m9dk4m1b2k6srcgkqhfr/55934672449.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/buputuf.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/u31jmr69gvv9fbakjveamfj856/15460370312.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/eb1ae83c88200aa29a22ba306d4c6c51/14089715591.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/10044882939.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc102d74d5---zadosapofepisenifiloziz.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/lumejuwofumana.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/wixadoxelizo.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/kadedukujibijotaw.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b00bc666b436cfeb8dddfffed6bf2ea4/77596337703.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/dpagi0hc9km56jrqn50hea0hg1/sirazodez.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/6015977536.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891236d16ed---zelebadenusoziwe.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/nopasotopokij.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/lerelanumejalumi.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210613164942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=business+english+writing+books+pdfPDF 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_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 11088 bytes
SHA-256: 05531aa6bfaf2c9d833c1e97644ef3d3f36bfce1b48444ec283a33addba5a88e
font_01_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 18220 bytes
SHA-256: 43e934fa908828eafc3f6f934312e352a8636c0aead98f4aafc7e3fa59a3e5b4