Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee80ba7dce64347…

MALICIOUS

PDF

86.3 KB Created: 2021-07-01 00:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d1e6b186d5587eb94c183a5922477f9e SHA-1: f94ae90cec6ffc0a7f18470592c87888ee170c10 SHA-256: cee80ba7dce6434769ba83403a3e0843c7bc51c96c8125af87be44ae92002ca7
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Disable or Modify Tools

This PDF document exhibits social engineering tactics, including instructions to disable security software and execute commands, indicative of a ClickFix attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a secondary payload from one of the numerous embedded URLs. The document's structure and numerous links to potentially compromised WordPress uploads further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://picinterior.com/ckfinder/userfiles/files/bupezifarugigubonomaxok.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/547d23fabd24cb10faf233a558527f89/magavepodip.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5ebh4onrj59o3kb04t6n9cjqm0/50697232023.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e5b6276e9687859b91b36d26d469dccc/negowilogewasofixupaza.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/5624533889.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/87847567042.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/39835344577.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/jujixikomiwofadowotar.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/62930891346.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094740d32224---38609561518.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7db31b951b5d0270b285beb2598251c1/kadetebisawitojagebow.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7cd69adbd317dc4d42c20156790a8552/99788513015.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e6bcc5d4773bc169bcfb6e5b39c9ae7d/23424615704.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ed2b38bbe64199b1d8acbe04088f416d/zekejuzugesanunesarino.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/bc11a2fd96dbe8f80e5a5d4f1c063127/49380626099.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/41167371802.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071a68cecdec---bexobazom.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a2fbd3cdcf29cfdf80defe87a0a1411b/8745637186.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dcda77a3d285897ef1113d4413aa93f3/55486362422.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/941e2ea0b7a9400f91739bd5652617ab/58041171024.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/934ea1feaab0e709cc497712fa3d43a5/71544294647.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c460e0242---28572161746.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vvp7kd2aebr22t0e9qdnqkghl2/metisobiwefu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c26a7d66cc---63333026084.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/81da705e86d2ff6631f8d2fb6081756b/78742396251.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7919d79fe0---danuvamosirobimodupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sims+4+crashes+on+startupPDF 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_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 17268 bytes
SHA-256: fddbe0a25946eeaede5ee8151a0b896ed572357e22677ba46cdb9868c6a9eac0
font_01_sfnt_off00011aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 10844 bytes
SHA-256: 81775a4dbf362978937c4b87eb594fd77011ae7f2886e4a267cca406cc0262c6
font_02_sfnt_off000133df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1