Malicious PDF — malware analysis report

Static analysis result for SHA-256 93854f70864a5a13…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 09:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d92b16c0f7bd33b502b68870b30461f2 SHA-1: 4342084c6d9685113a2b247f2dfc68b33aa67335 SHA-256: 93854f70864a5a1334f2dc5f23ba92832d950f707aad0b1e04352e64e9520120
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to disposable or compromised domains, indicative of a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or perform additional malicious actions.

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 http://goforthegreengolfpools.com/userfiles/file/tojamirinarumutudazekurep.pdf In PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/6194145589.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad01156b83e---41593635371.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/pukuzeliv.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/foresetefekamobeti.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb8039aa61---wetavezuluwedasimezijimav.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/381d45fef894c0a2b5593fca986c4fd5/wetemes.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xemuvikuwi.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c46cd4e8---xowaraxeduwof.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0107f5a2fa---11552901532.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/70688033843.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/wabipupagedigagomuku.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/wobavetetinunabureb.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609871723623e---87723241838.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b584847d2ef---83663277729.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113f4e992c88---lukorobe.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/54957781316.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/45377028810.pdfIn PDF document text
    • http://co-mit.com/uploads/files/23921761539.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/widerugizu.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/kurivogunidimi.pdfIn PDF document text
    • http://ozmutludokum.com/userfiles/file/zawasowire.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f47807cd1c8059c30b8ddf43876d25f/74702177617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=como+se+dice+manualidades+en+ingl%C3%A9sPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/96818647981.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_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 19652 bytes
SHA-256: cdddf625002c58f6df430d356feb48a151053e1b7432d73c31f9567e9c7e8178
font_01_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 10800 bytes
SHA-256: 61bd9cf42a276ff5fa436168bc8ea398875d83cb8806d7a4037e3408ace3bbd7
font_02_sfnt_off00012271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1