Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d88724e9c5a92f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 04:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 913f8a425969380b17ed2f93e576f23e SHA-1: 680726787c5a3fee5ddfc7e127ae8caaed1a7fd6 SHA-256: 71d88724e9c5a92f2906246dbf071e2d351aa0a7ef1364f6f90ca427fcf25f11
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The presence of a 'link farm' heuristic and a callback lure suggests a phishing or scam attempt. ClamAV detection and ML classification further support the malicious verdict, pointing towards a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=set+up+nearby+device PDF link annotation
    • https://its-bulgaria.bg/files/file/58088122315.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/nclg1074gkqqs8c9j5e01a8ifn/69144633367.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/97121101950.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc183df6d6---75431748744.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/12566315041.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/9445020106.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/rozibejosukadumatoba.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/71315511926.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/49536332558.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/wamapugusaduwuseweve.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0ujfhtc07pl0krthl4tahlv3e8/lajidixipipawesimifade.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/50609725492.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jjmbhcdf0pdbs3rhtk359ik3sl/saxokeragil.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/43366372655.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/57686739990.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf4c20b13---sipasev.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/mofepi.pdfIn PDF document text
    • http://asja.ua/userfiles/file/43042717099.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/xifedijifuvetefexukos.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/36000027479.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/mepalagaribiwewuwa.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/57111543779.pdfIn PDF document text
    • http://sayarbobinaj.com/file/vipiluwadivizogigofeju.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18670c57f---32854801046.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_off0000d48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 17968 bytes
SHA-256: 765f4594909f78252fff154f3c2a57c5289eb97e110d8beb07413a28ba8d301a
font_01_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 10668 bytes
SHA-256: 3f0c23b8c48caad19f1a30bede47a7fefa6764a71c6113a55f1076b428b6f086