Malicious PDF — malware analysis report

Static analysis result for SHA-256 83da9ca3689246d6…

MALICIOUS

PDF

95.0 KB Created: 2021-09-05 01:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cdbbbb5933a6662fc1f6ee6cec4bcaf6 SHA-1: 143bf7eb754b0f83faf85d0a830b88eb6f911d16 SHA-256: 83da9ca3689246d6103737f68ca05e12e3a309fe035e33115f630b8870cc2dcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely to lure users to malicious content. The PDF structure and embedded links suggest an attempt to exploit user trust through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://aquafilling.com/userfiles/file/87169266590.pdf In PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-1/20210701230010394420.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/30685462671.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/bazeluboxopimadufogid.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/435779146d5283213ea0dcb1a418662e/47540729673.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/878e77ed199e687abd25a92cb391554c/zujivanizamir.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608200879efd8---25737584842.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160841e5a99b78---8371643186.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/sodaveze.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6b6fc48a8---76443405846.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/2817kj8rgim8fu5kkp39qno1hg/vafowozaj.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/mitoxurasuwigaz.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9b0bf867---femixonibudezeligubena.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/57555078560.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/nujesijasavuvutabogewadut.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/66485144361.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701eb303bbd---mataj.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/57068353384.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nq7bk7f51fo1i67dqtamhncl53/wipero.pdfIn PDF document text
    • https://harom.ro/files/file/41447489926.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/36333417105.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/36257724978.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/firanebeloramepidofovif.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f62f130a984b6baf8a76de0eb16c706f/mufobamotevinabo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085da6b2146b---32638455862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=spanish+2+placement+test+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_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 19588 bytes
SHA-256: 4dec64f19f664fd8991ecab658048cc09f70158813475d6f630ace402b368e67
font_01_sfnt_off00013d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0F 10860 bytes
SHA-256: 57b395b165904f647c2077486006e74500a4dc43142b42f60edbb2fddf93d04e
font_02_sfnt_off000155f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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