Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa10f82fd3d296a…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 22:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5267a27efe9d8314e47580e6abdb164b SHA-1: 986cc58067ca931a954d5ff02cd831e1ea5daf5f SHA-256: 7aa10f82fd3d296ae89ed6ef2b3405f87f45d1e8829cf4d201d63c741b34185c
156 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 functions as a link farm, with numerous URLs pointing to potentially compromised websites, including one hosted on a compromised CMS upload. The primary purpose appears to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f184477574---xeruvasutexuboxulogenaku.pdf In PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/6566620704.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1d2faa836bfd21176091246c38b48c28/kogixexunamibakawinebom.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210910213234.pdfIn PDF document text
    • http://asfalon.com/__files/file/87407314138.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384ee48e21e---wajiwuvoraf.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/80440572996.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/27963468321.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/bemuso.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/74303373402.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/96751232120.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/sijisafulozemitod.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/92390925085.pdfIn PDF document text
    • http://synhbio.com/upload/files/jolotevokalijogodizulewi.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/79979164102.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/44389732293.pdfIn PDF document text
    • https://vestol.bg/files/file/tiseder.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/88717854742.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091821463573499.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/laroje.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137ecb0e3aff---33961769427.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/repitelekedufirikosukam.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/67697059981.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/27515123115.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406c49a9d57---47670209616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=english+grammar+workbook+for+dummies+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_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 11248 bytes
SHA-256: cc394b34ed75f16e902880b4ca969f4109603eb077a67148e610aa40e05a816e
font_01_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 17988 bytes
SHA-256: 2de2846bb76b8dbfd3ab4401876b776fbe004e800a69102125eda5c12f75e6a1

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