Malicious PDF — malware analysis report

Static analysis result for SHA-256 226cf38172e949a4…

MALICIOUS

PDF

87.1 KB Created: 2021-09-18 20:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d048cd38dbe5faa32b2ec6256854792e SHA-1: 15c3b04eea96586f0f6a2e32d5d0632b56551d8e SHA-256: 226cf38172e949a40f54c9d2b77669505b2ffee04ba633f489ec31eea82652be
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 hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of a link farm with UTM parameters further supports the idea of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=how+to+setup+office+365+on+android
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5e46701f---29196225870.pdf
    • https://rent-1.es/ckfinder/userfiles/files/faxavot.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141735c4afbb---sugow.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/81447733316.pdf
    • https://pottoka.info/files/galeria/files/tozuvevovajugatelobabugo.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/sabuwexuwozosovalujibil.pdf
    • http://fantasymusic.it/userfiles/files/jazuxinalomabodel.pdf
    • http://studioesflores.pl/obrazy/file/97330268979.pdf
    • https://observatoire-omic.org/documents/file/29975787926.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/6b4afaf5fdec2e900f99fecdd825b3bb/58929712785.pdf
    • https://filetorme.com/upload/files/90832043991.pdf
    • http://netmode.net/app/webroot/uploads/files/14470390432.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/simizepanepobasadin.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c01c5f153---badema.pdf
    • http://em-mould.com/ckfinder/userfiles/files/xukofojumikiti.pdf
    • http://rucodelniza.ru/userfiles/file/94301468029.pdf
    • http://theofficeplus.com/userfiles/file/moritemu.pdf
    • http://fantalife.nl/userfiles/file/kukesazokiferif.pdf
    • https://tsolisp.com/files/file/xaxenajajudimoviro.pdf
    • https://aprenda-atdi.com/uploads/files/94828137990.pdf
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/59066327190.pdf
    • http://squash-fitness.cz/userfiles/file/49556238851.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_off0000eb60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 16792 bytes
font_01_sfnt_off00010377.bin
b0cde7f9383a90aea5fd6f5353635601a443ad2fa92de4394bc761f5de0eb88f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 11220 bytes
font_02_sfnt_off00011df5.bin
8ffdca5d7a038e13551b1e92360a9c6da96bb1674a398d1e3804ce1b93db71eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 19004 bytes

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