Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4c001f3abb4536…

MALICIOUS

PDF

75.5 KB Created: 2021-07-10 11:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8c1ce3bc223974e5fb74462391b105b6 SHA-1: bfbcaf0457635cacf5e392fa19f3f850d1f9b342 SHA-256: de4c001f3abb4536e41b79595a72626ff58670a1ca4e355883988ad562dbfa9b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to multiple compromised WordPress sites hosting other PDF files. The presence of numerous links to potentially compromised CMS upload directories suggests a tactic to distribute further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/f9360c084e08e06ea02eba156b64aa3b/gonawe.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/669q8u8j8gh6kpv02mchcbdru2/24114376930.pdfIn PDF document text
    • http://leton.pl/userfiles/file/98618097075.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/6e4ecb35e3cc4a2e464498cb55e28d16/bebagerep.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b9992a197b2c4f046af195ca4163a59f/nipotimujoxadoj.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/q5a5njbkrtqmpk0qtepat0boe6/80610723517.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2c829c77803ab33b4dfee955c27de4b9/netajetukadud.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/tirawixo.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/lunekovureberikikejozuv.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/vofak.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/80764533682.pdfIn PDF document text
    • https://laser123.com/geektic/files/rawagupiwaneximuxazalode.pdfIn PDF document text
    • https://plasy.com/uploads/file/fudunaribodebagu.pdfIn PDF document text
    • http://amandamaitland.com/images/file/35313365197.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608101029bde1---suvetu.pdfPDF link annotation
    • https://www.nstoplana.rs/ckfinder/userfiles/files/51596720480.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c60b46076---5011019684.pdfIn PDF document text
    • https://domilot.com/uploader/files/nokamoreporiw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f623780ce5---14048487034.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/39001345994.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/0a5a27b7237d14be9aff6538e382fc48/supidogiporadorom.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bae5b6eae---sarodafugina.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/27095694643.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609625a3900f1---81031449050.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/41789007013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=2008+g6+owners+manualPDF 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_off0000c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A7 10968 bytes
SHA-256: bd46d9606ceda1d0adfed8d50a036ce13729cb2a54c5a5d839183cbf1a221d96
font_01_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 15732 bytes
SHA-256: 92282880de6bfe61dd17f029c0957650cc45ce8be028518cfbb0845a4541d833
font_02_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1