Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7303434f1dbe54…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 20:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 756a102ec4f4d4e9d65892a474a57d9a SHA-1: 73353b131a0a99137ba2293e77557761944bd906 SHA-256: 9b7303434f1dbe5420f8625f632ab9d18d55d13b0771ad2f3b8361e1cf088458
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://durgabas.coop.np/ckfinder/userfiles/files/76216958387.pdf In PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/fevomevigeporol.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/81077588264.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/gomekagepijixegit.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/21255087372.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/96786272040.pdfIn PDF document text
    • http://newshop.jp/archive/file/65251328722.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a723514c---16026066253.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210908_080811.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/15680253754.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/15901704998.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/30173039097.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109020804583485.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/kujesusofem.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2b305a507cf921ba944112ca90f250df/78711590874.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/sokewodabuzabok.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/58193241622.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fb0185e7fd143109e5a2f929c3dfdf50/57999401007.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/foridixorobipu.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/wujugozutibavowuvimajido.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f1bee573---wogamixepinolarefilujoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+restart+usb+servicePDF 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_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 17296 bytes
SHA-256: 0ba327b334882ec7513600a97b60106a83ffd361508d6505678589affc3ba6a9
font_02_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 10604 bytes
SHA-256: f1052bd5b635a338082adb3f336c5f0b69f5f12314c3b10f72a90b001d8fe741