Malicious PDF — malware analysis report

Static analysis result for SHA-256 861b46bbbdeb90b6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 00:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1326c386223379f729b4efbd97341a45 SHA-1: 26303af0219238cb49e72ec72d16df45321004a4 SHA-256: 861b46bbbdeb90b626dbd1933da78908a484d8aa02eee1115fee3ed84e5ca229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ottotech.center/userfiles/file/36705660160.pdf In PDF document text
    • http://industrialsupplies.pk/userfiles/files/gatibuzaked.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd3fad766---petefodiwizopu.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/mufibewikumikaminejalev.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/pizepazomu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/e5440mj64frgs3vspish88cic0/safojisaribigajusu.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/99947936713.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085b22ca2f70---94662830520.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3b4acfb8f---37800522927.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/bikexivifexexajinijebowop.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/gojerilixuxakidudaso.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/xobek.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6af4592702---90644637755.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160702cf888945---21266298463.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/91338342789.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43227392187.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/botuzolujazusomimav.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5e07092422c0c903b08f7a1a3b69db7d/89522733433.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f854d916d---pomudolojipum.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/48858748137.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021071911534073499.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/bafosirigir.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kukapisajekizozeredim.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/7e87ed2b278e0afdffb4510e297203a5/wugivesumuzeratozudadedun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=counseling+and+psychotherapyPDF 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_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 19120 bytes
SHA-256: 8259af65f8fa53a04e542869117b04a437fd73e77e0a87c6393699479737acd5
font_01_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 11036 bytes
SHA-256: 4ea34d5ce60484e587aceea825ed9520317101fc7a656e35dcf7b42b31ccd7f9