Malicious PDF — malware analysis report

Static analysis result for SHA-256 986c8cc107910b8a…

MALICIOUS

PDF

68.7 KB Created: 2021-09-04 07:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73acf9d52e6c1bb73b73078a071305c1 SHA-1: 6d1dfe530831d76dc7e2cc2db475b440983c4919 SHA-256: 986c8cc107910b8af77fb3970f3851bcf8ee2339226319e9640f6fdf0f079fe3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and a high number of external links pointing to potentially compromised domains. The heuristic 'PDF_IMAGE_LURE' suggests it's designed as a screenshot to trick users into clicking, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly indicate malicious content. The embedded JavaScript likely serves to execute further malicious actions or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://realestatespoznan.com/uploads/velipijurupanupaxexeb.pdf In PDF document text
    • http://status-go.net/gfx/userfiles/files/29551195331.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/vizaguwoliduwuwuriromofur.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52e1b85e4---pazawazivuresodabadezu.pdfIn PDF document text
    • http://sitpchemcieszyn.pl/_sitpchem/file/48400917734.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/doserow.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/77232770055.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/xipufapurobi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9f0b90a2---xawafitubonabivimoto.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/nivibebebat.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/24398513459.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/14408204800.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505210144706053.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f0ada327---pasakurejibat.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f4fb3f429ee1fa16307665c8e123c4c/80033862059.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/59049927949.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e83df10d64c9c70a5eb200ca3ee63aa8/78033408449.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/5271c2c02a8823b326949e9882cbdf3f/56974094262.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/fakirukakukotesum.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/34537736897.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/sofagudironotejoritixezaf.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/84980985129.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/wugupefid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fane+loudspeaker+enclosure+design+and+construction+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_off0000b065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB065 10964 bytes
SHA-256: 5a52a2675807ff9ef5650338a490384532ccb9a727964769d0eb41343ef1d8e2
font_01_sfnt_off0000c9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 14464 bytes
SHA-256: 1a0d6ddeb2964fa133cbb98ebc0ccdea20c9ce48641cd4723cb35e51367bca1c

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