Malicious PDF — malware analysis report

Static analysis result for SHA-256 f411e9c510d4e668…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 18:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fbf0f333f994f4371f6148583f74d38 SHA-1: 68fc9a9cb9f6ff9f499fb88516636ae085bc4408 SHA-256: f411e9c510d4e66865d1a67e91d92588f5740c6e4a64f14d01816d26e9ca1cef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to disposable hosting and compromised CMS upload storage, suggesting a link farm designed to distribute malware or facilitate phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e75712d4f9---19982064653.pdf
    • http://toshiteriyakiburien.com/uploads/files/4918658777.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac32774c4bb---nerefodavutizik.pdf
    • http://adlinefor.com/home/webagen/public_html/korn/data/file/2329122565.pdf
    • http://amexeuro.com/an3_Uploads/file/26704089904.pdf
    • https://phillismaniglia.com/wp-content/plugins/super-forms/uploads/php/files/6700e4d6b00147d13a972daa20b4fbc0/83675014955.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/88aldvcnhqq22j8n9e70kde4p3/wijedobakusuzanet.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c882f89b0c8.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/midine.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6nu4j0ub8fm1glvugdpnanvo8m/29072349973.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7o9ciu1lu23f899u6b0vb63v9c/30928728176.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a47eedd9ab5---wuzabubikedufegirotedi.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11c2ce5c66---bewuxomeze.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bad2532b6---tomimozilirolaratujebutaw.pdf
    • http://timandlor.com/userfiles/file/5586112498.pdf
    • http://leaguengn.com/userfiles/file///1283471954.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/5kqgoqhe34fgkl5fj7h7jpkore/38439578026.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4c7992ab15c539552a9d2adf0e84b566/zumomoru.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/zudojisavu.pdf
    • http://usdcp.jp/user_data/userfiles/files/kosidokusefitef.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/30c6333159eb8cf36fd640178ce00be6/81686097846.pdf
    • https://kingdomofgodmn.org/userfiles/files/43557177553.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3cfab4284---15315050890.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55e9870761---94510810039.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cat+solved+question+paper+pdf
    • 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_off0000ecf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 16792 bytes
font_01_sfnt_off00010508.bin
eafb834ed0de9bd9f2523521ec28eecc34de4f2f81ed97805452e73085bda9f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 17052 bytes
font_02_sfnt_off000131a5.bin
9a2d16d25b3e5b60eae35a772f26caaad3c8bd115855e3ae265cf3e52b942866
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A5 10836 bytes