Malicious PDF — malware analysis report

Static analysis result for SHA-256 791d8bbba1d7f930…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 15:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ba6a4d54ad686c0198aff048c21014f SHA-1: 2775a559d12dec1d83d6e81193bef83760aefbc2 SHA-256: 791d8bbba1d7f930ff8d95d4fbc8776854cd79090c7fbf78e42eb42f9c16df1f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://irlanc.ru/uplcv?utm_term=resident+evil+streaming PDF link annotation
    • https://elemonbg.com/Files/File/jibiw.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/21302465360.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/87924524132.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/68861222111.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/83637494245.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tmspt9jqj0hfi0gu999f8djr9k/tupipiriviporuzapo.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/zumamabovaroxatuzif.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613090e441208---13413582932.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/20189543442.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/66360715799.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/11240326160.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161365b5b44a2a---kaxugit.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/4100267941.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/fexizivazov.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/49709881237.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/sobipamigojurowugemazoje.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/61104888164.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/75208127659.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/fewavabenomimemef.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/lakiduza.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/84452040375.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/ramupenelajijebagake.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/744812453.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/18746796527.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_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 18928 bytes
SHA-256: 8d6e792a6a0ffa2132081baa47c7d4f1f68ffeeb60a1f606ec2481404a71cf6e
font_01_sfnt_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 10580 bytes
SHA-256: e7434365f41bb439cde2e41ed9bf0ef77b41c5edfab3bbc5148ba46389471346
font_02_sfnt_off00012481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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