Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ccfc7a60c29165…

MALICIOUS

PDF

79.4 KB Created: 2021-10-24 00:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 45a1e4941a055cce523b7264f090c406 SHA-1: 5e2da9b0d0e65f1f0358188df29ca60cb2e7f721 SHA-256: 73ccfc7a60c29165975816def9c290c5a45fefb862e80710b260492374677c70
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=tinged+with+sadness+meaning PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1616f9be43d5ee---mesepiza.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/17525119346.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/caed1f6ca253d75b2f501deb6a0e3b16/85386086761.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1616f315532f89---96448864757.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/95422824434.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/kolezurojul.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/82321955044.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1616516c11ac7e---jogifiwores.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/mapokenadaxasub.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/81736316686.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/rozedububokitesonabudejol.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/45627066729.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/warovigasagukepu.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/funamituwi.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/tapexukimi.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/86402020804.pdfIn PDF document text
    • https://0900107678.com/upload/file/77149597523.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kavidiwogonibatozoxipus.pdfIn PDF document text
    • http://pharma-tools.pl/galeria/file/74970501690.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/vijonadidixiwudesipil.pdfIn PDF document text
    • https://wsbtitan.com/images/file/19829429952.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16146fd8603ce3---towowumakikawamuro.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/20650293075.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_off0000ceb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 19196 bytes
SHA-256: fba9ccfb9c01806c52b2ff56fd18ffe481d5d90296e67fd56fab5bf60b52ece9
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 10480 bytes
SHA-256: 6c0108b8b88c892ba9c5966a3473cbcd932fd6e41ab25d2b28e1c844958cfe4b
font_02_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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