Malicious PDF — malware analysis report

Static analysis result for SHA-256 065ef063555e4f8e…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 08:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 947848911ff1dc8cfa297c607eb3caf4 SHA-1: edf7fe6e56fbf3ddec5e53269b9f4da8c8dbf7fe SHA-256: 065ef063555e4f8e54c906b8bccf5c078454e8c472653d56d4d5b50666db6690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=mathematical+statistics+freund+pdf+download PDF link annotation
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c218da7e91f---45880837866.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/kulutijagawumimuxanalexu.pdfIn PDF document text
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/11216749850.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5b21f4499887b78e6b4df9a66f701ae2/1827982001.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/801hf87acu4fli8acrhg0q48nk/toruwip.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/wuruvide.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/16119330512.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/zalax.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/newimisobefopubaki.pdfIn PDF document text
    • http://nincity.de/inline/file/32518292849.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/87481659976.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161162236c21f0---58959603260.pdfIn PDF document text
    • https://medtek.vn/storage/file/bugidaxubopasur.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7ed476029---66987115211.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/zameguredakobukimodubak.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080e458e8231---94342364938.pdfIn PDF document text
    • http://julianina.dk/upload/file/bakixejudif.pdfIn PDF document text
    • https://nexusmediation.nl/files/zifileb.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/godumepelej.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/97412878139.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/95185245544.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/fibetojumazaxetivenudakop.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/76522d181a45ca06fea715fd73f721e6/somixoxejameduno.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635b436f8f---davegepilitime.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_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 11064 bytes
SHA-256: 637eada2f93634c10495b0e272d28258d7b5d299ffa66719231b4b0a77ea1fc0
font_01_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 18200 bytes
SHA-256: f8603fb41cb6235e23d1feb88ba8e97bd8204f602c277f4dd947a8dbda6074b3
font_02_sfnt_off000135a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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