Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a3f38dbd1b4c57…

MALICIOUS

PDF

91.0 KB Created: 2021-08-06 05:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 933c3fcbdd4377977a9d263543404eee SHA-1: cf5cdf454784d23ad885bdc0d21b52a902d8a31d SHA-256: d1a3f38dbd1b4c5793e2ad04200603ff17f44b8984fbf1229b195d1f0dfd755e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 http://realestatespoznan.com/uploads/weradirusoxoxadogaxuxijik.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f290dfdab---bidarifiwabum.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092287c0fe46---17674751164.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/53784684339.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/b018eb7ab77296987243af9aaf4fd91e/zorerivad.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/3cc70c12a2643ca930b388072757fb77/xofoxipub.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/6e8b27e093a13c311d5b6e9f8256b2bd/6564562097.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608341e6bca66---xegefejasunanonuba.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd69f3744---74795971664.pdfIn PDF document text
    • https://ingmarcomantovani.it/file/buderimiwazaledajatoxe.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609a88b10c12d---gezisa.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/06f0ca91a90524434b4a0339e36fb5ba/kekimalanifojalarozobebi.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/99435249266.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/duxoturuwideduxobar.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbf90fec5---73177664081.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/14790458721.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/kilabobutu.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/kojafi.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/kv97orcfnfbs0mbrcm5gfs2afn/87410004106.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/waduludas.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3986a800a6bad27aa9f39d4861d6bfe6/fetef.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/28584458243.pdfIn PDF document text
    • https://jslt.site/js/ckfinder/userfiles/files/10164459122.pdfIn PDF document text
    • https://binhvi.com/upload/files/18510381979.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/bozalefetujirax.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e60efb5d331bb8fe2d65a99d1b453f93/pumuxezobifogupigogu.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/50822288587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=why+the+rich+are+getting+richer+in+hindiPDF link annotation
    • 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_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 10424 bytes
SHA-256: 48f6389da23911ac975d22bda60dced5c25e420639d29a72de1cb28a5ad7827b
font_01_sfnt_off000116c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 16964 bytes
SHA-256: 3635649e8c94d3d6b85c7706c78d3ef1c74f24693e3ad727f8d3e3d0372d8d06

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