Malicious PDF — malware analysis report

Static analysis result for SHA-256 99abfc53bf10d204…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 03:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad6f2e5ed8507e9244c84dda9455dd35 SHA-1: 2d9ca8bb068302a1c02a4cd00f72fb977f355d5b SHA-256: 99abfc53bf10d204c5f8d6994bb7abb7c6d7748f7ffa302111e358faa1ff5a97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://a2designbg.com/userfiles/file/60721024322.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce54a8e27---rimowivivanulutirelig.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/00acc8a8801c893820b7096183ac987b/71724832284.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f35ff45084f---23755880349.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/losugazafig.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3abda2bb56---kapuxinid.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c5838012b456f812d0dc39397f1e1cf6/17532321458.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/94102706072.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160710020a8b18---94420386334.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/donafufixevo.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/42aa7db1a4e9a0aea0304de2dae08f46/sivakiva.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/putowelejabogepuzo.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/86303899378.pdfIn PDF document text
    • http://whatdwellswithin.com/file/xatepagejuparajeg.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/7694fe61e9aeddf5dd53800e3c4d0453/78966375924.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090acf88f495---jozope.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/jidujiwudebe.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac5cd001b01187dea4b5b938b90b27be/39804467653.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/fukudalixunisikikojo.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/livekekut.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/lemumijo.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/sijibupuligivi.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/85060906793.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/91800441090.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/nadefuvudizediwutubafipat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=canadian+citizenship+study+guide+questions+and+answers+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_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 17988 bytes
SHA-256: 7cf3aa13125ec9d80ce23d3ec17894f93b17de67b373816ddd8357290460d7bc
font_02_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 11392 bytes
SHA-256: bbdc886edd07329681e28a5cda9c4c83e8ce6f921dc6ac2861adbfc0c1e926c3