Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f1593bb3e90f20…

MALICIOUS

PDF

79.6 KB Created: 2021-07-05 05:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: adfc3cb393a3c8b9deb2feadd215bbee SHA-1: 31807a268b37778e829932a7ed3c6a89a4d461d0 SHA-256: c7f1593bb3e90f20bee99940570c6e56731476ad3814ba2d09a7b2d0c6225e1c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/dfac6e5a695f7d99d03ef9d3d7e55b77/wojejigazo.pdf In PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f6b09a5ec0d501582bb7e390f303f481/71631845339.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/58410659150.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p72bv732n26juehngerclg5d1k/tugakatogi.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987a26d8ac6---powowinuxinaruzibojuru.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/83828958255.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e42c0516000d073cbae85236ac70bc6b/mimuxixiporogu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7db4bbc0352e6bea3b7b6fb36194e7cd/xusowudodajifamupa.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/cb0c00a4dfd42bddc7572b179b9e6b5d/nugexefadaxopijifosetur.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7d5fae381---13481970537.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1456b477b---15855626675.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/ludevebifet.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/76a434b12e9e9273d61b34135746caa8/ximadibijoniraw.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/wuxikuzitizozofejivi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac8ff3e982---70143156968.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/psnp0pit9o2f60dl0q4g9ao7c9/basafaj.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9fa730814e0ba3842c0813f951efb18c/7806393226.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a3b5a3427---nerozepel.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a00e83cc---5744434838.pdfIn PDF document text
    • http://ministerium.pt/files/65351918362.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/tezifikipafanijuwelunejod.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/wudegol.pdfIn PDF document text
    • http://amandamaitland.com/images/file/begidofofisebofujuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=convert+50+mg+to+ml+dosagePDF 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_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 10852 bytes
SHA-256: 740bb78b6ece4ea11a1aa01a39e15f1a1f1881e7524f7110c35bc17fc3d870bb
font_02_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 16404 bytes
SHA-256: 07f60c13ea13aca74e5acf80a241d54ab44e3781f8a6f205ea3127d3ce0f8c98

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