Malicious PDF — malware analysis report

Static analysis result for SHA-256 690adbcd0a4aa071…

MALICIOUS

PDF

89.2 KB Created: 2021-07-05 17:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3e4f2257d7736d9d9137ae44af8d4b31 SHA-1: 4edbd1e7e01ed55e576110e5be3a6b7f83a7d51a SHA-256: 690adbcd0a4aa07161673ae25ff23f35bc09f67efd8a7d16bb11867341adf663
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. The document's structure and embedded URLs strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://xn--b1akwe.xn--p1ai/userfiles/file/nebeturefuromavodoxa.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458ac7c37d---zadabukusaxisewem.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/215cc3bceabf1e6abd264291e20f61f8/sukalobixaduvutev.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/31039da16055edb72f0538645ff3c938/wawenafaralir.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/mofogobalozafifivem.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429222606961686.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/nalevobimatipezawuzoxomo.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/kulefarurutufaw.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4cb29cd1---rizubuwofarubazetiwuwew.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/zikes.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/zalopagivijuremarar.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160986800d5a21---kuwazoxikefumes.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/88726512060.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/43baed20cb9e86fb6f64fbb87643849b/93187462116.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/080607c6729675c60865170d6166730e/17845954769.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/sn7gbopd85fm6fihqk3n58bdn2/14734003803.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2dd3412148---pasepubapazaketasata.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/tabisij.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/94974219298.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d81428d39e---46701021775.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/sasawufe.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/nagadovabobunuzaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=yards+to+miles+conversion+formulaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 10788 bytes
SHA-256: 3a7368a2cf7ff3687b837f9689da957eb45c599a86e2e674af5379a1062c9f89
font_02_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 17532 bytes
SHA-256: bdead531bd2cc20ee7648fffa9cb4ff7ae952c9c0fc379029d4e9023ee6cedd3
font_03_sfnt_off000141cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CC 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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