Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d1ae2df17cae66…

MALICIOUS

PDF

88.3 KB Created: 2021-09-12 10:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b231a13cf018208d070dc1e11de20f14 SHA-1: 932f702c2be661a68775eb8a59a0f72f7007f4cf SHA-256: a6d1ae2df17cae6651b358c6f53d5ba5c9bda333e61f42c3e44fbf972b4eebc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://toscanafantastica.com/userfiles/file/biselu.pdf In PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/11946519658.pdfIn PDF document text
    • http://fpole.ru/sadm_files/88682319127.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/53645947493.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/fezigat.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/7279527592.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e8729a066---rolazekegasakivewu.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/bojogi.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac28963da---37727589163.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210910183628401590.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/0p26k044gmp28i3mnatrs92hau/29595131356.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d89fcc2b4---mipavigo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c43ca204a4a23f0b0a93eee7eb546713/78602926183.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/66650318655.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/binisinuduvikurowuf.pdfIn PDF document text
    • http://attlas.center/userfiles/file/kilolepesi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa06c62a72---39203127542.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161379c3534389---meloxazidoretetimoxotipev.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613675df12732---99161802749.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/wagatuvusowezotamepevadi.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/29215441408.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/1dv68osodsgrt187sgkrhhqdqd/45923189132.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/88590042184.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/72873928957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+send+photos+from+android+phone+to+macbookPDF 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_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 18628 bytes
SHA-256: c5ddd0343d9bdc102cf8394a1f21ae3ea6a74d447a10cdee82d960c14d4b15ea
font_01_sfnt_off00012166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 11148 bytes
SHA-256: a777abd1de6add4c9fdf63e81f3d983dda8011dfa9f119b2e796c92fc9b1e76a
font_02_sfnt_off00013b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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