Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa4679c192fe709…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 13:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35f1828676a4388858aa400aee3697db SHA-1: 260ce942df64465b6b25d1b8ec9f427706847ba0 SHA-256: 6aa4679c192fe709f2a6438d9cd34da4bf6b9938336f50a3c4d646c033c8afb2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=mahendra+guru+current+affairs+pdf+july+2018 PDF link annotation
    • http://www.armstrongre.com/files/files/gijonezajerufedame.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/45804939777.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b76e92941c---63509523935.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c489e9c85a9---togitelerolud.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108300717415732.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/galiwosetapuribifu.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc26ae57b---46356726902.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/tumiburugedojasujijabufog.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/lotopodonalasejix.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/wajiporigaboxuligo.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/julazubaduvu.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/5815884125.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/81774226512.pdfIn PDF document text
    • http://dallaslandscapedesign.com/media/files/midubizigoredatefadodubil.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/figorikeguzatu.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/78596770298.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/da45kbjl8snppajt3mlvka1ojt/77660624450.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/44857457119.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/80673346110.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/u5akspam96e5tcm6vqkptfnjdi/tejisiwumoxipatetarumivol.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/duwalef.pdfIn PDF document text
    • http://zuche0551.com/upload/file/pododajedelanawipud.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/87d7872937c7e125e408703b62533d01/19524616481.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/gobafegulapus.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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 16780 bytes
SHA-256: ffffc9ee4308597d4dbba7e959e09039532e5ffa2d098cdf9515d80f4448b0ee
font_01_sfnt_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE0 11620 bytes
SHA-256: 7ffc204e7ffc1e0e48410d8b92d637059736f40c1dabba16040f6ae622f1aa9c

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