Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e704d08c59630e2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 21:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1c6c2475e0bb641d50d2bff90de034e SHA-1: 67571ffed76037385d5a9b78ebb6c81070e34d59 SHA-256: 8e704d08c59630e23a36df33c74543b89c2033b7bb2b3e9dae88117c8a487dfa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, 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 malicious URLs.

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://cructi.ru/uplcv?utm_term=editing+software+for+windows+7
    • https://nomortiga.com/contents/files/81402925602.pdf
    • https://ecotranslation.ca/upload/editor/file/josuvedokepubobasekasudi.pdf
    • http://nguyenthaotech.com/upload/files/37586470344.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/45789556850.pdf
    • http://auburn-companies.com/userfiles/files/26869357848.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/6926730.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/lebot.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/puxefotujufevozozope.pdf
    • https://mangalargalux.com.br/ckfinder/userfiles/files/95833060022.pdf
    • http://parikshitconstruction.com/uploads/pizunifoxipidadaritaj.pdf
    • http://mgocsm.in/userfiles/file/tidozofudinuzasufuzinu.pdf
    • https://cissud.eu/uploads/ck_editor/files/jetiliwal.pdf
    • http://langeline.com/ckeditor/upload/files/pegadowedi.pdf
    • https://eledigitalpr.it/allegati/file/lokut.pdf
    • http://mwbright.com/upload_fck/file/2021-9-1/20210901170903665753.pdf
    • https://helicopterleasingservices.com/userfiles/files/65533399905.pdf
    • https://bibonatura.hu/ckfinder/userfiles/files/937613172.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002519c9db---donajojovabonadu.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc77f886fa---73591618597.pdf
    • http://nwhouse.ru/uploads/file/xixekufa.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411ae38464d---24337274973.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9ccdf0ff---31508859175.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nevijijok.pdf
    • https://llbyggodesign.se/UserFiles/files/pezidugubagemosovan.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fojivoberilujuw.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_off0000dc86.bin
4e22daf255ccec3618c4ae9e20bb088cc711b3b86d85b7b1639cedf197f2be7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 17980 bytes
font_01_sfnt_off00010a93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 16792 bytes
font_02_sfnt_off000122aa.bin
2b6f43df6b31ea1ac7d52be665e687a1149ff94f360888b2dbb49d54ee594fd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 10604 bytes