Malicious PDF — malware analysis report

Static analysis result for SHA-256 933e162d0d41b42f…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 18:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0213e1c7de3e5d7d781cca1f992f371c SHA-1: e9824242b6362c3c55f884985e947114a29bdd7a SHA-256: 933e162d0d41b42f80943352d11247f2b8bc219927eca1cb731ca4658bed75d0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a callback phishing lure, prompting users to call a number for fake issues, and contains embedded JavaScript. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of JavaScript and the callback lure strongly suggest it is designed to trick users into revealing sensitive information or granting remote access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://potentialdesign.cn/userfiles/file/1631089583.pdf In PDF document text
    • http://volareinmongolfiera.it/userfiles/files/xivuzopun.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/51034008213.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/zoxifawe.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/3343078189.pdfIn PDF document text
    • https://agatanorek.com/files/file/39336867567.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/68150570964.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/21697919992.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/dofujizotetusote.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389d386f16e---26061341180.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/77365121791.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/bokamiruf.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/45309595989.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/muwisojimilasa.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/df9la6qbsic9njngq8olnee6pf/zuxomakokod.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613528aa74760---febuwategalewifugurep.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/fivowinijujejezumebujog.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/62318825567.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/wewutib.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e0a51d6b---pubejokawagofumezofa.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/78355369200.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/zaxaxalukexakumudobujef.pdfIn PDF document text
    • http://coachhouse.info/assets/file/gewufifepagowaf.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613157feb468e---39517065245.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/9458210326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bop+it+maker+manualPDF 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_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 16956 bytes
SHA-256: 6f428bb0111867d6d96571d71e22af45f15237f4f82699e4343c707c50450640
font_01_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 10488 bytes
SHA-256: 2a4ef4a53d84d3ac6f2b81c7a17e7d7c7bdc961a40a87870b8477e6ef1fb0bce
font_02_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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