Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5e80fc2a101d2b…

MALICIOUS

PDF

81.6 KB Created: 2021-06-26 03:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 412501fe3916c0bfc634435e2dca2e2e SHA-1: 384b29e996df177ffacaa3215239c9da3cc3f345 SHA-256: 6d5e80fc2a101d2b79dd29f08e7868732e117fa3451df95d984b08c2951723ef
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure suggests it's designed to act as a deceptive link farm, leveraging compromised sites to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=early+bird+catches+the+worm+meaning+with+example
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/vp1mpaoponqpkfetkcstulp84n/bekebedizarilifisiza.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083296aea647---golixawud.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/cbea4ba5ab93e771331cb70f97b191b0/viduwafiwelol.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5fc4f5d1c4ae3bb69cadf0aba6bc0583/12409548448.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/aad3f76b0bf1b8c34c25cae11233f591/1693836958.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b43389595---73782007556.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081a1f950a6f---5188468552.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef135750fa---97481689231.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/tejewadirudavoripodajuxu.pdf
    • http://avandcie-automation.fr/ckfinder/userfiles/files/70722594752.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/wideravi.pdf
    • https://evergreencans.com/userfiles/file/48815061566.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75fb77b39---54688418080.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c388724d03d---komilejijejow.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/2f2e7fcd5ac9f3ba991e6a211c4daee9/xabitisasejodipe.pdf
    • http://toyotalongbien.org/data/dulieu/files/fudezakugiwenaziposuj.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/9aa9b50e30aa38feb0abe18556325e24/winabeni.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/r0jj8f99nhorpoogodgie92ct2/41968010212.pdf
    • http://brenno-tojestto.pl/userfiles/file/datevekuwezoguju.pdf
    • http://gayaarchi.com/userfiles/file/20210611034504.pdf
    • http://krzysztofmalec.pl/gfx/fck/file/megojeb.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2e65183a4bb737bec751c21066117f26/62727843619.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/957387d0f656975317f8fed02f35b5e4/fekituronupiforu.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cc2f02d56---4099892521.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f1de6e9de67113a88aafcb4259eccb6c/pamibelodabifapud.pdf
    • https://anfauglir.com/images/file/78305130515.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/98712a4924f429ecf445e00f11bd357d/vudokagasopafalaga.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca96.bin
8578dce535535ef41a3328cec88c62b00161ef24d78692424d412bbd07cc9932		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 18744 bytes
font_01_sfnt_off0000f972.bin
c5f9d802c48e551e240a7227ef5d48530c14b84dede236445c7e77559749f25f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 11388 bytes
font_02_sfnt_off000113b7.bin
817033778b9228454a1ffdd1fb7acfe7e9497d2fcf8e8dbbfe1a37da4b4bb3b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 3052 bytes
font_03_sfnt_off00012021.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 16792 bytes

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