Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9e816f945e4350…

MALICIOUS

PDF

159.6 KB Created: 2021-07-03 20:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d4a3f53bbf3cfa0a3028a6ef2e6db256 SHA-1: 01d434259a39e53c86363558f0c007fcec6bdce6 SHA-256: 7f9e816f945e435094d4c4f5ddc44e455d4351d00833bed968ddb3e8e7fea5e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. This suggests the document is designed to act as a link farm, potentially leading users to download further malicious content or engage in phishing activities. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c4aa4b0ab---giveputigu.pdf In PDF document text
    • http://voxel-avocats.fr/uploads/file/witezizevuvolopobopedapu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c71cdb0f0---25460212524.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b084d6998a9---8940939354.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/gamesosagimivupiroxelu.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/aa025ec37b953e1b1a56ee96039bce3e/37931684567.pdfIn PDF document text
    • http://chromatographvials.com/d/files/17194546050.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c49679c88a0---39678260593.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f6d8f38a---75616427107.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/10421942791.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/zituvidalavizafim.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ajm73r2qt5vair4dcd359p3hpp/lezexavikedobo.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7n0hrhmk5vh8ar84epnr29uh5t/66486154754.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/noloxisevazekorebut.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65253ec97---70549275905.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/6aru814tf3hgtngjdafj8o14r7/podunoninumopigama.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/g99f3dru8c8qi55ksj8hqf615j/vesowaxomavazopananejox.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/22561de498156e516567d3bf87d83e78/82538531689.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ad6d4bfb---xotokamekosowomabuxedatol.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/61578fe96452cbe31a7ef6bd31699a3d/wezevabibutolurojutup.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99aa6988ae---98787060379.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/baa299d4d8f818ec1f035fd5d2f8185a/36814503101.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fff44248b---japige.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62c366009---tenuworezutolok.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f23c36b696547611bb4f9ff61a1836ab/25314130032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=innocent+erendira+and+other+storiesPDF 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_off000215f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215F5 16688 bytes
SHA-256: ea9dd7f4672cb25a561a7fbed14dbd841bd091ea5650ba8eb0fd7f1fd74e22e0
font_01_sfnt_off000240ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25906 10372 bytes
SHA-256: b39d17f28bacfaa01fb98c1d18216396d6e0ef1d4e4ac92bcdb66b0cca1ccf74

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