Malicious PDF — malware analysis report

Static analysis result for SHA-256 812a0919dc670ce3…

MALICIOUS

PDF

88.5 KB Created: 2021-08-12 21:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 291e4638df2aeb82d32c7e0c7a941ecf SHA-1: c3df6c5bab8183d6e10402c08c5134436a96e5b7 SHA-256: 812a0919dc670ce37f814df66e785bdf58b5a054f783b120ddcb1322daaf8f63
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://chcial.ru/uplcv?utm_term=jadual+caruman+kwsp+2019+pdf PDF link annotation
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/75b0ae4891900f3510b220f227d48c10/fizamutowenejimopewugi.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5a491e06b1ed65a49eb24f9af9fc2f09/53874606619.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/muwunonaf.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/43423714343.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6441d462848945745a4ce83f10f13980/figurorexiga.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a55d2738b---demisobuja.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/gobas.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/78565263313.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e6c2eb4dd5d51b54b0a2264fa85e9119/lusokon.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/52680828026.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/xezizobisi.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/denelekasikifujazeka.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2k393s81u6feulfnsh06c53phm/27883399883.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/v6rfd51bmbqgfbmqou61c9eu4e/86714526786.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/59581572269.pdfIn PDF document text
    • http://terminsk.by/pics/files/laxugutevuva.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/kuvuroxemapemenoxesoren.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/wewurokex.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/5063222218.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/xanamilidi.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/bikoxaka.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610668dfe7376---xilivamavevonusuvalasofus.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/30275735914.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8237b19064---nilifox.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_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 18272 bytes
SHA-256: 8339ffe0bcba044dfb5603194ea7f27c8c1d984649fbc6ae42e5ae37779fce36
font_01_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 11072 bytes
SHA-256: 37e371c85cd938c210ffb7ba0e7845514b9da63584e9d04468644c8fbcadd0a9
font_02_sfnt_off00013b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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