Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1aa34d9a4a2a5a…

MALICIOUS

PDF

96.4 KB Created: 2021-07-31 20:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06542d248535dc81be243f23a3b4c6f8 SHA-1: 196b7b1debbe518e91c79a33777621f42b1c9fe8 SHA-256: 4d1aa34d9a4a2a5af3684e37ab8c7aee28d4083eaf85e74f8151ff8ab2bd5e30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://alshuka.ps/ckfinder/userfiles/files/32107114939.pdf In PDF document text
    • http://mfcpavpos.ru/file/73168803272.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/dixonakarujulimavoj.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160820f0504044---kizulubajukimekobip.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de21809a4---disuvima.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d0b7d8fa4---sajamiximekupeleg.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fitamumow.pdfIn PDF document text
    • http://htwy.com/upload/file/16684686214.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/8d3905bbbff9b6751294a8c3d9289dc9/tibibobopakewedemuxa.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/g8gaerki4cc1s186f1js4cbail/75247629962.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/0caf3fe178ef7a677d829687f06d816c/1581513048.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/02535471dd0e4c37da12b62d496ae708/10756093615.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aaf4c659a---rokejekox.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/80895744879.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/kujenoj.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qo29rlhtpg45du90ndrqb0jh22/90809231542.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/pikemisukiwixizexunek.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/rinotur.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/bosakapikivapovopubufo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7054545914---subewemedadijofirorol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=spanish+comparatives+worksheetPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d0b9ba483a89bb87105a64d7da728cf4/zuvabisudu.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_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 10912 bytes
SHA-256: df89eaa97f3dbbae7b67255fd67a8b1d2f88562df289ba3a08b39e6380717da1
font_01_sfnt_off00012997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 18480 bytes
SHA-256: 006f3e148b40378e90af88f1b446d35e644caad9047e525432a9a6044e2c6b2a
font_02_sfnt_off00015988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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