Malicious PDF — malware analysis report

Static analysis result for SHA-256 14552fd4c388b4b8…

MALICIOUS

PDF

92.0 KB Created: 2021-06-28 19:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa74cfa265203011509d0a0bf7cdf25d SHA-1: 2617d06767d8b03ccc6d1a6af1c584a578ce8874 SHA-256: 14552fd4c388b4b86fa2920eb9362ef3178b1c6b4e6026835ae4f14f31033cd3
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm with multiple URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0203e249c9---jikaxorofidu.pdf
    • http://aite-materials.com/upfiles/file/supudesalelulegeboniniwi.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160881abc91ae3---48885791222.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/f545kihc3v3cq4603566si5ntv/gigorupomeluwekaz.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tqf5r8n2db7hjt0u9r7m89252h/89940108694.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/30c9446cd6588be8661f40978e959394/56705982639.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca685ccea---rujatorup.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f3c4f1fb---60468722461.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/93046d8fc2e26b54cc68c9cc959fd593/suzuzorunavaxusisim.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc650da936f---79225470617.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a801bafd7e---jekonofugex.pdf
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/pawexa.pdf
    • http://infrabud.eu/fckpliki/file/10358390464.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ses69mt7ise1lklvjv00nid2br/tamapijewesopo.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9bdb84a406e97fd8a2bc685b4d5d110c/dugeridutuketuriwuvedup.pdf
    • https://lienlacanien.com/img_pages/file/42418649137.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e530c205fb---48013659076.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/9ad7vnbsij2fk4gk04aq5aats0/32709242561.pdf
    • http://botosani.ro/img/uploads/file/19881901637.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891ef27726---fomikum.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5f84a7367---wujewadevixegavirujiwak.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e80963621---37584274148.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c35786a75a41d7a25b0f8808d56ca85f/loxuzakenuk.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c88e5fdb7---zonenopexaxenujanoziwe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=token+economy+system+template
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001056b.bin
a9c20c649ef7bf9f29c11c2ee166eac7227c319841d30f3a63692094278e9b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 10512 bytes
font_01_sfnt_off00011d7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 16792 bytes
font_02_sfnt_off0001358c.bin
558177582b9d25caad25aa9ed133b9ce949261c3a3bca45895073585726fc287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1358C 17240 bytes

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