Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea66925393c5727…

MALICIOUS

PDF

104.6 KB Created: 2021-09-03 00:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1174cca9c920c1b23819ec8c5996404 SHA-1: d3a99a7684c5a8a6c0b946f77a659929c5019347 SHA-256: 7ea66925393c5727ccf3a9bd2d2ed9d16d84aa1fddea24a1e3745ed9da4d04d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS platforms. While no scripts were directly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • 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.
  • 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://gotoippc.com/ckfinder/userfiles/files/57976737212.pdf In PDF document text
    • http://altinay-law.com/images/file/xuxavuwuzizukiwiwenonol.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/nepozosoka.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f34f22adb---26835740921.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gomopetoxomelajup.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/pimeragifomegasiwor.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/60802114861.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/vefuvulazivenurezu.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/mumikekazajorudoro.pdfIn PDF document text
    • https://digireg.si/upload/75628405252.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3750077a2f---71437629063.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/18371088650.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b09115fffb0fc6c40c5609ceb27fef7c/54447888687.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a746efe5494---93654463045.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/eb5db8bf035ecbb8878bba6a4f3feca0/kefapazemikojonexu.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/75287616663.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/lipiziramejujumanitolusa.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/zukalapakideza.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/luvafod.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/sasolowupenew.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6fbe1f6e66cb55775a6e380b3462b56c/jokanasuwofekananovemanu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/asdsq6e3d0v91isa0lssv5k2k5/wifuxipoxupijagelukur.pdfIn PDF document text
    • http://go-forum.cn/upload/files/2639884862.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/753f3ac0bb3d2b29a4410044e0a164c8/89392104637.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa777c2d0---58841906353.pdfIn PDF document text
    • https://allianztc.ro/files/file/mopepedolanopegusevuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ccna+security+labs+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_off0001301d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14834 10880 bytes
SHA-256: df8bfdfa1a200df697e5af0aa0e508e5676a2832e549aebe938b4d9fab6f91a6
font_02_sfnt_off00016148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16148 19600 bytes
SHA-256: 3476c87f82558c672834b062a7ace629fd5ce426331cbf812067c3faa809f17a

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