Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea028dfc88d3e31…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 08:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4bdabf0c196b6a88a8a06467769d7a4 SHA-1: a820434d7d9d004058153a71480afaf2cefc3811 SHA-256: 7ea028dfc88d3e31db10d71a77993788e82cdcd90342dcd6142e34ac55e17e78
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting it's part of a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure indicate an attempt to trick users into downloading further malicious content, likely exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e778a1f2a---10386466626.pdf In PDF document text
    • http://myhomeinparis.com/userfiles/files/51450559751.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/19a66e77b17cd88362cee4d6bea9046e/tolenewo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bdc4b0730---mujufi.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/kojij.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/08/file/13704300325.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/82877796152.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/zarusefigonaru.pdfIn PDF document text
    • http://maxbrio.kr/files/files/deradibixikazowimivek.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cceb41f052e690ed6656a3b7e5bd23cb/sawuburakomebaz.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/foziduxavuz.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0e0e01534264d06125c6fffccbb5de20/75229236175.pdfIn PDF document text
    • http://bjjiffy.com/upload/zojelidewatamukiwejutob.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/85444196992.pdfIn PDF document text
    • http://regmac.net/userfiles/files/88541917353.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/44196648435.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bunogilebamelu.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xuzikibu.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/80847843431.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/zewilim.pdfIn PDF document text
    • https://thepainter.asia/upload/files/73042934543.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/67008121456.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a216a665f48---45734220180.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/700406881.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ca39b3b2b---litolabuxased.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/fefojekol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tspsc+group+4+hall+ticket+2019+download+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_off0000daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 17388 bytes
SHA-256: 19ccf79b916ddc602450f0f72677e8a66b64221bf5aed82d2558a54c7853d600
font_02_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 11680 bytes
SHA-256: 9e58cb23f7bb46faf4cfd85b2a6b367929937ec1a26848e5d1361fb1a6387e47