Malicious PDF — malware analysis report

Static analysis result for SHA-256 480cc1348d363a74…

MALICIOUS

PDF

96.7 KB Created: 2021-07-05 04:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf1bfe618bc4c40dc2fb35dbc808cdcc SHA-1: 26c38b880373b9632c331e38d25cc262fde0363a SHA-256: 480cc1348d363a740bfe659c0ff4e03c41231c3909606483dbee54ad33cd9004
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and contains no readable text, indicating it is not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc62e5c88f---javamavemu.pdf
    • http://casier-a-bouteilles.com/file/62087724055.pdf
    • http://pinturasoltra.com/images/slider/files/59948957484.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4386ad9576b366039691ec14d7c06907/busumudalurasipidiba.pdf
    • http://paillasse.hu/userfiles/file/jijuvanikume.pdf
    • https://mabuksusu.com/contents//files/rozugip.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca3d7d444---gedawolinizogimajitonone.pdf
    • https://sieuthigo.vn/upload/ck/files/58884192700.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/momusipumetasobasiw.pdf
    • http://mea-travel.pl/userfiles/file/xofuvosiladokamagu.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/43637148753.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/h193rivllp052tuut4dcac8icl/bopufiwiparexo.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077771c931a9---wepojuparigasok.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/modokalopewodupixod.pdf
    • https://auto-rujo.com/images-editor/file/telovi.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997bd37af2d---bexirivugukarevuzumu.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210605_13A822EDE03214FA.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/hc1hh5536o1kc8me84m173t2a3/gelefem.pdf
    • http://aapltd.net/userfiles/file/pegigeratixos.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde71c831f---weberokirivapesufilap.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083204f28818---vutefapipegoxakugekef.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fe133777---jimitiserowa.pdf
    • http://falerisztika.hu/tmp/58717196894.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/40c5710ce670c3e62ee78c95c8245fbe/vutifeluwujafutemixubebo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=scan+direct+to+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001193f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 16792 bytes
font_01_sfnt_off00013156.bin
39bd28ba2a4a276752bbd481f1bc3fe31fd54d0369ad1d867834fb9b2d3bbfb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13156 10476 bytes
font_02_sfnt_off00014945.bin
6ce81a5e2d3fd13de4527dc441617e7adb57e23338ed8117721ffdfee2a04b53
pdf-font-stream PDF embedded font (sfnt) at offset 0x14945 17152 bytes