Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c8ebf528d2ce32…

MALICIOUS

PDF

89.2 KB Created: 2021-08-03 23:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4efce9ce9a9c801731aaec67975c62a SHA-1: 232907ceceea7ac247cf28274dab607f8aaef0fb SHA-256: d8c8ebf528d2ce3203b0e00cab22833655a0062f16e1bcc9162e64c2a42e8c8f
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host PDF files. These PDFs likely serve as lures or phishing documents, aiming to trick users into downloading further malicious content or revealing sensitive information. The presence of numerous distinct hosts and the structure of the links suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e073f6032287332c48cd74564012fbf2/rugonofujaloraj.pdf In PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2a4e54fceac5fb3c9909b0d72f37ed66/nifexobotewajejuvax.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5da22246---75625092674.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/46556277400.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mkcfvirlobsatgrmpjdshi6p01/72840630218.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/files/19088830751.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/74041277988.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/kibeb.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6c266064c9f25f72cd48a1162f361a31/456532703.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/sokamelodusiso.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0946a95581e0ae6c8638dd4b663866cc/razifitejifavujewabigid.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be09b4140c3---33309448038.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/49d6be73cc1cb7f6b7f23757fc9caab0/vikiwamulutebog.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/44667757257.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/23899477980.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/57094207516.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ecqh41c2t2590cqa573hid7m69/93903198936.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/72485660400.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc454f006---dotudajawadedifozefo.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/34066119570.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/5616235663.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/gegasopizilapupekegutoto.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/kegiregobexosabigujogug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+take+apart+a+dryer+for+scrapPDF 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_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 10656 bytes
SHA-256: 12d33df5dd705497ec53fe1ca24e4cfc5d68e080f05c36214559a496db20b5f0
font_01_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 19340 bytes
SHA-256: fc56c9964a56d55820a97955da95ad65fb6b491b6b8308e7898e8ce93171d43d
font_02_sfnt_off00013ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.