Malicious PDF — malware analysis report

Static analysis result for SHA-256 2473b2efd4d85f5a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 13:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6a75b57d43e80324e67e9293d2be65a SHA-1: ef8cc74cdd737cd167664d552ed0bce51809281d SHA-256: 2473b2efd4d85f5af8e57707a5716211f6ca7f58f929d97f07c6de7f4221e6ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further malware. The embedded JavaScript is a common technique to initiate redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://pistant.ru/uplcv?utm_term=toyota+auris+2013+service+manual PDF link annotation
    • http://csc-021.com/userfiles/file/20210807121226_gstao5.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/futabojekizuzuvapakuvado.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/wazesulutat.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/456553716.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/52158859610.pdfIn PDF document text
    • http://lyshiying.com/d/files/43052899573.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f9818352e---bupetudegiso.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/44af5d2f536f072e73ee0d83d35a3608/67397551189.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/11064085106.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1d9188ef---jaralebejori.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/241005326513.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/43778592179.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5097b6a1df6cd8e19ab109763cc7b46f/fabobef.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/0a61bdf2f5720a13853df5b66f8f4e87/11881944765.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/bufinupajovupojo.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/49310455544.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/wujixamixududob.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c14245128e5---92336558216.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e643c066dd---26606721855.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/tudawolef.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/sapawetodi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b3b3fab2---wewapuvujijotenerixanoras.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/48374d99j9mffbk8u1f08rspe3/72976290963.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d625a2b559---30525996833.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae486ba0898---jevozosoxujuvoxapeke.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/28114968060.pdfIn PDF document text
    • 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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 22416 bytes
SHA-256: 7ad8396736505d113a21605dd3b3bb2ed0a20f8567640021e817c753b3de8dfb
font_01_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8D 11100 bytes
SHA-256: 22caa04ab3355b10747ae47720e7d487cd4b5e2c7b932d5f5076b308d347c336

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