Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41817f35eb0fe7e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 22:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8feef46e39530470f548b3a33d5dedd SHA-1: 9c6f9d463abae8134b2841ebf4463da897af9be0 SHA-256: b41817f35eb0fe7e5e44a7ca5220c779316db8dc6a83dcdc688423660628d8fa
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and multiple external links, including one pointing to a compromised WordPress upload directory. The presence of a 'download button' lure and a callback lure suggests a phishing or scam attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=utsav+1984+full+movie+watch+online+free PDF link annotation
    • http://smolninskayahotel.com/userfiles/file/joxoraretejedi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481570bd8b1---46309719962.pdfIn PDF document text
    • https://udruga-invalida.hr/files/zepozos.pdfIn PDF document text
    • http://asja.ua/userfiles/file/mulokezisalinujeluvubobu.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/senevipij.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/zidixatonowotibigoseti.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/rukovajaruj.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/95869933258.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/zadigebepinabopagun.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130190bd6ebf---niguguzejamutax.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/nomudexare.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/zewimutowewuz.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/27028131705.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/rabudet.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/14870295529.pdfIn PDF document text
    • http://feminella.ro/upload/fck/14835200678.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/87611883709.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090808034334.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/gafixegevoxojemilatib.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/tewalige.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/tubixivazinidufipu.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/fb29b188b06dc91f472af2fc2267f9a7/bepel.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/95972125690.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_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 11364 bytes
SHA-256: 438d1cf77cf17547607dd571b6f17b7429a286c7fb9630f75c0b8fb78d0a721f
font_01_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 17808 bytes
SHA-256: dc5bcc63853c0a2da0fcb6c4030b416413f66c3a823431f70a84495a8f0fdf1e
font_02_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1