Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff3ef90bdba3d97…

MALICIOUS

PDF

81.7 KB Created: 2021-06-30 03:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f6a805d22c32e3a99176662d3901a5f SHA-1: 450ed9cd3f3277381f61736c675d3bc0250bc2d3 SHA-256: 8ff3ef90bdba3d97f78fc1ed7fd4072d47ef6abf303dbb30ee144bb13c6bd887
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous links to compromised WordPress upload directories, suggesting it's designed to lure users to malicious sites or download further payloads. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e4587690---41343673621.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/86657831296.pdf
    • http://co-wemart.com/careeruserfiles/file/fegizabanok.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c705a0a67a9---radoxejekukeraxo.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c658c5a2e39---tixisukapipotajonoxiw.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ns5962mhikcg6a11vuokerlj56/79589764948.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a63d5ec259---45013295053.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2912f9a91c58746682357c1a9f80d304/sebuzumunud.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/gfbh9j0ah81avj7c2frp1s7np6/60877916621.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/40744882778.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/af7d198794de66811811967babeec334/vofetuwajupuvuworuvixu.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/77636065588.pdf
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/88591981680.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/cd1b0cb123bd9046bdbd1868ab8323c1/lezobofulusamowes.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33eca36371---lalizabigodujukofajuxavok.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/577be74e280f2883705115bcc19063f9/vabefowonuj.pdf
    • http://bogelaipigeon.com/upload/file/bikesafinovisonivele.pdf
    • http://zhengfutz.com/v15/Upload/file/20215211514471765.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/98f3aceb8148c30e94268b3a6fe67d61/4711335200.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/c4d0da8e8e968912754464ce8e795d09/ziwalisumiloxu.pdf
    • https://manuscripthandler.com/userfiles/file/20970832982.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5f7118deb77bf479ead730b1c9521982/58195956660.pdf
    • http://serramentisiciliano.it/userfiles/files/venano.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbeb82ca24---mivaja.pdf
    • http://www.abcklima.hu//data/editorfile/jawezubo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=scientific+notation+rule
    • 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_off0000dbe0.bin
380f6c02d2b06f67a53c6e9e2432cce8f1f0e9b44b4104f7087505e4950d2694
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 10336 bytes
font_01_sfnt_off0000f35a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 16792 bytes
font_02_sfnt_off00010b6c.bin
5ba190654a45e666de0515d5125c0eec820650a2a8311db9e0260970aa13c5aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 17488 bytes