Malicious PDF — malware analysis report

Static analysis result for SHA-256 055b305db75c3e27…

MALICIOUS

PDF

93.6 KB Created: 2021-06-28 07:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27363c3f4cef99747afd3a405cd7dd62 SHA-1: 5a07352a456164b2c69d04c6af17fd5fcaef6cf4 SHA-256: 055b305db75c3e2721ac1ca35c50ad83b5756de28114d9b8eb1fc576aec8471f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to potentially harmful 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://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/312f928da60c63f6a798fa6876d4685c/rizumijewalebamag.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91fb65feb---97789112448.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7160d8a53---wavegar.pdf
    • http://iwilldoit.ru/uploads/files/files/643944616.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/b4b35kso0nnkf8v9501pnouvil/34141769606.pdf
    • http://parkhighclassof60.com/clients/871169/File/rexupu.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3abc2941b8---mawaravafifuvekigum.pdf
    • http://curry-box-deluxe.de/userfiles/file/77752512737.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607bce8f80571---64225984116.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/mowubarimawixopamono.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ca0ca51814746c95aa0ae9896d9c846d/katexik.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd757845d8---70290062649.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b54a77a1---97271117389.pdf
    • http://samafb.org/uploadfilefiles/1170573643.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4cfdda6b7d5f32d4ba0a7ec14f887b7d/zezelagosix.pdf
    • http://kwong-cheong.com/userfiles/bofiru.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160832060ac471---famomexuxijagilokul.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/66fb9676ff25d8377705d38e07df6aca/fopasotes.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc96b3b82---xojuwegagogavifoluzufi.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f367365cd---39560029293.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd42540e649---6314014481.pdf
    • https://butchercurnow.com/img/shop//contents/74508080849.pdf
    • https://watertorens.nluserfiles/file/57428038981.pdf
    • https://chupwo.com/editor_upload/file/49672668377.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hvac+design+manual+for+hospitals+and+clinics+free+download
    • 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_off0001090b.bin
928cada26834dc5763c211da6bb0f620556821f20b34f4adb67dfc69b7123891
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 11312 bytes
font_01_sfnt_off00012342.bin
27490a49696999d8a055cd5233d09ff44e0d7072aef6e38759bb8dbdcbb119ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 17412 bytes
font_02_sfnt_off00015097.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15097 16792 bytes