Malicious PDF — malware analysis report

Static analysis result for SHA-256 4752e0784694fe03…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 16:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e1cb192eb6f059dacc46e0e4a6312d2 SHA-1: 2a3a6823dc4f4a83d1bfd319ed411ca88d7adf1f SHA-256: 4752e0784694fe0362c449b275e025f791e938de8ee31b146817eb7631ca6266
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rentcar888.com/uploads/files/202109070153248618.pdf
    • https://chulintemple.house-well.com/CKEdit/upload/files/wokejaxufumegigunov.pdf
    • http://idominjazz.com/fckeditor/userfiles/image/bubedopavusosada.pdf
    • http://transcash.com/ci/userfiles/files/4724905276.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/42897899784.pdf
    • http://ghibms.com/userfiles/files/tisobuvugapopojonafi.pdf
    • http://bwemfjhjk.friend-match.com/upload/files/21589179070.pdf
    • http://locthanhwindow.com/img_duhoc/files/42508568147.pdf
    • https://gites-les-bardots.com/userfiles/file/xodezexija.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/14188495174.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/06b304c6ff861c61df5305ab5c879757/dopexe.pdf
    • http://knupress.com/pds/editor/file/41825196387.pdf
    • https://isabellepieman.com/userfiles/file/41955526151.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/ligelefideza.pdf
    • http://kutyasturak.hu/images/files/gimawepiwuk.pdf
    • http://yuemeism.com/uploadfiles/files/rorovadaferejovuwej.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/af6d6e1605a097e061dfb24a933f7110/xibupigizinekipijekutotu.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f373b35cf0---xunaratepa.pdf
    • http://savitaco.com/uploads/images/files/rovikuxu.pdf
    • https://signos.larrialdiak.es/files/galeria/files/karusatakobum.pdf
    • http://wijnhuis-vaessen.nl/site/data/ws/files/lulemoziguxod.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1d7c407249402888acc86a1042b2c31f/zenebopa.pdf
    • https://alcoquimicos.com/ckfinder/userfiles/files/48482965775.pdf
    • https://carcable-bg.com/uploads/pictures/files/33034195527.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+can+i+retrieve+deleted+text+messages+from+my+galaxy+s9+without+a+computer
    • 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_off0000d56c.bin
f5d6611e3ddf93080e59df551bdf7b4e6884f2adb82c1758487add039211773b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 11692 bytes
font_01_sfnt_off0000f0fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16792 bytes
font_02_sfnt_off00010910.bin
e4f2b247ac4f4d72c11dc5351dfcd4dcfb522cedcac4329c24fe6186c0785b4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 17492 bytes