Malicious PDF — malware analysis report

Static analysis result for SHA-256 462cbc3d865aca2b…

MALICIOUS

PDF

88.4 KB Created: 2021-09-01 01:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea0027bed140a91808d0a905c37621e0 SHA-1: fc53b38c7ffb98d4cc688e382bc92363cf335bb8 SHA-256: 462cbc3d865aca2bc4e691c490e836faa91d4059a82d94d26028ad9abbdf8406
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to lure users by mimicking search result links, likely for phishing or to serve further malicious content.

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 http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/dawutelewunidikix.pdf In PDF document text
    • http://bocghebinhduong.com/media/ftp/file/97594399189.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22e84092ee156e05689cc0480ebd65e1/33422573717.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4f0bbed54419ce6c08caa94c1a6e8f2d/mozozorubitenuvuxilivuwe.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609253b2b158d---biwabak.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/mubazubadupufuzevu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t84tu3epf7rte1pfv9toj5elo2/xoregivorisokewufem.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6340206307---gufezesutisitet.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f3f1442a5---poduguzelodaroko.pdfIn PDF document text
    • https://jotelek.hu/files/file/tutekojifu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160979660ebbb5---44296731044.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9h67moa34qr5ttqspic3ckp192/kukigetifisirilem.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d9eb3281484f6a1016fe88a43f0b59f5/mevowexezu.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/xasujudadexowe.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726582935fa---98206028546.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/18452147011.pdfIn PDF document text
    • http://whatdwellswithin.com/file/86208494582.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e485dbbf1fa240ec49c958ce4d119fa9/12606320988.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/54694367917.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb143cc7b---34939363859.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6b9b6868f0ae7c9a1c5dc7b9862a4e2b/8470450115.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/16903643016.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/69984272686.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/turavigoleninuta.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/12660164777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=learn+spanish+in+30+days+pdf+free+downloadPDF 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_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 19636 bytes
SHA-256: c76ba4b5650788760b583be198ccefa8d0bf66b573100bbc52d691c85d55b06a
font_01_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 10948 bytes
SHA-256: 610679ccb2b2752f2f96b100a662b93fe5b2fff29382bc7d4de92d919456e480
font_02_sfnt_off00013ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1