Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf3126f10a4e5ee…

MALICIOUS

PDF

73.9 KB Created: 2021-09-08 06:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c99ccacc8c9ff273967322943130d7a SHA-1: e4c11ee2664e7fe47ca543bebbfa406d2d6ed9c2 SHA-256: 2bf3126f10a4e5ee0b69dcf9f4db3bbffff6cb166ce866fa15f36ade76a327fd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute other malicious files or manipulate search engine results. The ML classifier strongly indicates malicious intent. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a distribution mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://phoenixturkey.com/upload/ckfinder/files/sediritisew.pdf In PDF document text
    • https://edgecs.com/documents/famulapigemojisasaxapateg.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00d217332---87961047690.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a378a8d1178---rumidigaz.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/54707935770.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9093a414a---kujaterodejoxisekururij.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcc9db1195---vutedaxijizejilazexof.pdfIn PDF document text
    • http://idroter.org/userfiles/files/gumarusolusowuxoma.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/73302938809.pdfIn PDF document text
    • http://laduses.nl/image/file/80830278225.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a99bad5c78---jakunopisajalaz.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/97242138380.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a783c9c212c---gunebazanaberamop.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/76017107535.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/barew.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/p00o11as2ha50e94r9gkh9drq0/povabomarazorofoxaxuno.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607385a23727b---ludobozikolajojuwiti.pdfIn PDF document text
    • http://yuhongzg.com/d/files/55682934818.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/a6gl9eraollgn67b8jhbis6ci3/69999691816.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7881513ece---sosekizofinilafaxopixom.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/milewawimiduminowefo.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/23760222903.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/jbigbfv29l3jtq8lt9qh9ph5sk/givirikexulupisewaf.pdfIn PDF document text
    • https://kawanmto.org/contents//files/95167590950.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d498a1c9e5---visikofokupoziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cancionero+catolico+2018+pdfPDF 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_off0000bb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6F 10976 bytes
SHA-256: 87bd80938b05b4657f6679779dfd931115e83642746b98098a99e63313bacb27
font_01_sfnt_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 17308 bytes
SHA-256: 65020c879b44cc167be6637b9f517d70d217e0b3635181b772c92084e34c298b
font_02_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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