Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb4ca692cd11677…

MALICIOUS

PDF

96.4 KB Created: 2021-06-25 19:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c386d1700444e5b4e6b014af9e8f3c2 SHA-1: eeb435be768892d6428630e7a814f4b5c831767f SHA-256: fdb4ca692cd1167736cab14ff5636f39b29495fc5f664776d47a6b51c6504504
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The presence of a fake CAPTCHA lure suggests an attempt to trick the user into executing a malicious action or downloading a payload. Multiple URLs hosted on compromised CMS upload storage and disposable domains were extracted, indicating a likely distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://insidethedigitaltrend.biz/userfiles/file/demepumedag.pdf
    • http://charivne.info/images/file/wazigevoza.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/pkt7j7do5lq3t9p767rqutcka1/7486586019.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e1c6983e7b80b87da957766d3b2da268/36455207189.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ac216aa7e2a---38918493445.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff4fac1090---letidineriborutijuxeterik.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f15c6f06---wugorisezimekigo.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9188deea---muxixaredewazeta.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/jufutusebukofifegamij.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d228061b---mizizat.pdf
    • http://allamericannursing.com/userfiles/file/86082922889.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8a814ae99f765ce95d035a3093a7f291/rosexuvipeje.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1b69da0b---pofuma.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf57a56bf0---nesovejutige.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ituk5nr49t5d2i0pv8dj5g470q/54704689565.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdd54c61c---75967732770.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c697ef3ec7---76089526671.pdf
    • http://infinijewelry.com/userfiles/file/dojozunaburedetunajo.pdf
    • https://baxsporthorses.com/userfiles/file/petewepagaxobivajak.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ts1q0g63fvhc0r2k4c1h3k56qn/niboxibumuduruwituvumaki.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/223ceda7914070d703deab0a62f35509/xozipubufi.pdf
    • http://immobilieninvestors.eu/userfiles/file/guwedugamoridiponubowa.pdf
    • http://tradeweb.es/userfiles/file/duximixapitipixe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=i+am+not+a+robot+ep+1+dramacool
    • 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_off000102e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 16792 bytes
font_01_sfnt_off00011afa.bin
d0cd95fa3215f0dcdabb4f86a5950b80bc7e1c0d6b25053efef43fd9cff6af3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 24536 bytes
font_02_sfnt_off00015ac6.bin
619f05f4212903cc6bf64e8dea66405a80da4d373c00d2e2833625bc6c1c9fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC6 10560 bytes

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