Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf9f2d767063b89…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 09:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f33d83cc15c03fe199686e116dfb73b9 SHA-1: 4e8b6edde2e723f0c91f1fe467ccd5603b765f13 SHA-256: 5bf9f2d767063b89be1ffc9db03b74933ebffb2803a8c37fc48bd703cd43bd49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a8b2be074---jemepub.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/32a764025b7ebb6d09136b43a97d3afb/75410117690.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fbd0396f6ccf9ed25b756322b35c38bb/bewemetutilamisatelefapek.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3737ba757a6b5a275c5a0189971997eb/sifodosawoja.pdf
    • http://csc028.com/userfiles/file/20210812013126_jceto2.pdf
    • http://condominiobrisasdelnorte.com/userfiles/file/womovomezif.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1b076b60---2582938671.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/gafenajirapizejokareji.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4ff51174669cb4c382c50dca6e59f91a/razekazepetebakelefigu.pdf
    • http://hodori247.com/uploads/files/39835512355.pdf
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/53862377913.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/69387158858.pdf
    • http://ty-int.com/files/files/50370213462.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210714_A0D024E6B31B1156.pdf
    • http://revucue.com/ckfinder/userfiles/files/8611231150.pdf
    • http://goodtraefarm.com/ckupload/files/48299985692.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919349307ad---99342954660.pdf
    • http://thamcohoaian.com/webroot/img/files/suruzisagowazawurovup.pdf
    • http://swhos.com/upload/files/ruxezipile.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/dei7c8mb0g1ti457pa5kihonj5/8812325231.pdf
    • http://capmar.eu/userfiles/file/legazikafaxaxusuralo.pdf
    • http://avanti-kuhni.ru/upload/files/sakikovevus.pdf
    • https://ducthai.vn/userfiles/file/7125531804.pdf
    • http://acecaalcoy.com/userfiles/file/27448671719.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=jesus+is+the+only+savior
    • 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_off0000e7e2.bin
5d3155a8b8414f0fcf16156afe3799207cc5774f510a9e581f56336ec38a050b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 10476 bytes
font_01_sfnt_off0000ffba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 16792 bytes
font_02_sfnt_off000117cc.bin
4394fb2089de2cd68a26bbaa8c550019e1fd0cf562a187ffe8a15dfe555779b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 19052 bytes