Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d6d2bb8140e624…

MALICIOUS

PDF

90.6 KB Created: 2021-08-14 08:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 909e0215bf4812799b90b12aa9792961 SHA-1: 8ab6f84413563324cc6c9b580e4893fffbb1e94c SHA-256: a9d6d2bb8140e624fa850b1d3660d9e7e478f588d0bbbb35f6c48aeac2e94a01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URLs, several of which point to compromised CMS upload directories or disposable hosting, indicating a likely attempt to host malicious content or redirect users. The ClamAV detection and ML classifier further support its malicious nature, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • 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.
  • 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 https://anfauglir.com/images/file/farulonagosebipujerejimu.pdf In PDF document text
    • http://bebelino.ru/userfiles/file/nimeludejoline.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/melexogegamasusug.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f06b9592fdc---laxut.pdfIn PDF document text
    • http://ekotronic.eu/files/file/sodixituvadujijifowinu.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/81515659522.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/2873499834.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/64010664152.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/46589066912.pdfIn PDF document text
    • https://casentinoshopping.it/file/82875692406.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/2567579969.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/gokuwut.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/78db1b740057a9fa461f2633865fdb56/raxofezaxisowenudikur.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/10679343771.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/87820620628.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/tolarox.pdfIn PDF document text
    • http://cosyromania.com/media/file/xixevixugidaxorepukekej.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/texosugo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb90b4338---62527589897.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/9f1d9a5af22b3907c14077f39096cfad/gowigubadukamewunoker.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3151a272c1---sopapivopat.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/6113349353.pdfIn PDF document text
    • http://glastergroup.ru/userfiles/file/pobesosuwapokobar.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/xefegumetoxegoxetase.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/59494114505.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/62444243314.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/rebirejinesosegegaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=descargar+formato+unico+de+hoja+de+vida+en+word+para+editarPDF 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_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 18948 bytes
SHA-256: df40262468fcee57a0d65bca2b92fcf01e02b2c8488dd97c04c523212efd47ed
font_02_sfnt_off00013f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F68 11404 bytes
SHA-256: c1295e91eff5552161c60502397d7dfd88b5bf3fa2669a8e77066a334b9d10d8

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