Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a7f24c7876f325…

MALICIOUS

PDF

91.8 KB Created: 2021-09-04 02:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f537c9ee1d56418245f690df3276216 SHA-1: 7eac3ef4712f70f66c489f7403bba4e77d7b6bf4 SHA-256: 64a7f24c7876f3253a04b91ff61460246c49e5b42e671f8d7f768531c116ec22
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bwawarszawa.pl/upload/file/49582686613.pdf In PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-26/20210826093023813874.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/napetezalixezesim.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/tamovidabeluwekozegaxorux.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/jevekaw.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/jojuxorigowanibetidazof.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/vezujisixifetaxosom.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/36353311171.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/o37highjo3ar27l5grgbg54cb7/77059912449.pdfIn PDF document text
    • http://proxima-design.cz/files/file/74654232452.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f01f034ab---wagobisofobuxof.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/60373573782.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/39bdks4reaatq5dqete324chut/83874188537.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/melefajinew.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dbc4d5f035d327179289732ce5c9cbd0/36405420751.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/nqn6hiddn9jh41f2r3qdf0jmu6/95415371526.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/95942139542.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/19676720941.pdfIn PDF document text
    • http://firsatoyun.com/calisma2/files/uploads/71493961481.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210605092949.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/susuxufok.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/18652677575.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/nopoboxiniloma.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/tajoxexazapejinodezawatix.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/xanaguxawifinejomunegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=desfloresta%C3%A7%C3%A3o+causas+e+consequencias+pdfPDF 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_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 20756 bytes
SHA-256: 8eb3db725d24d46f415eaf5e6496f54bd5f96f1b4bbbb8dd4c3455f3dad17a05
font_01_sfnt_off00012cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 11324 bytes
SHA-256: c0c93134c459ef345e68c84e63aaf2ffd056d82fa7836ea44ea90587a7a151a9
font_02_sfnt_off000146c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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