Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6b2ed8a0b00eeb…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 12:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bd3157449d4bdbc09cdc64e3e3f99334 SHA-1: 9911c7ad06c9e7a953ffc69d818ba5d0ce7fd839 SHA-256: af6b2ed8a0b00eeb35a8f7fecdd8dc5d0b099ac8c163933d2d939a3e552b8822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised WordPress upload directories. These links likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/84490acded13a180a543b6fa6bb89f80/76461696380.pdf In PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a08e4f223a7713bd1d7ab936e1d615d2/sutiromelaresu.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/4e9f252dd3b743088cb6cc87ea800245/63786301264.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/3lbo03fqj61ckt4osbtv11a7u5/27872147290.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b201d04f367b843a02df59766fd33269/rigezivuweguxekuzabilafaf.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a874bf48655---88222684883.pdfIn PDF document text
    • http://learningkey.org/userfiles/74071580291.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ll9ug5lubbakv6p0vbdv2p5spo/botamipepowezaf.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/wijisugil.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c130948db---samibagadixokubenuvurizaj.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/miviximixezurunutoxamil.pdfIn PDF document text
    • https://ahha.az/userfiles/file/23110027114.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/k6lil4ano2m5m7q7oa2mhf7ja4/64565498403.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b8ad6a27---zurizatutasetozuzitovudev.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/vekalosojovel.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47f855411---gogopibeborem.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1956d8072---kibatus.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2ebc41ea994c8c48af7ec1d2968df51d/73831953081.pdfIn PDF document text
    • http://allasclub.com/campannas/file/xukugidiremun.pdfIn PDF document text
    • http://jaatkinson.com/userimages/23199049793.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/n855tmft4kq8b846qh4bjrg2tv/mosasudame.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/35274123208.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/wivititirewibesu.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/jufunewerexetibaner.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/purusomepezu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/42b8d90a2c7b0a5c040b7444eef10f0f/12706808486.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/sbqdck95i6j8qs86nm2k90cq0k/87187886676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=images+to+describePDF 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_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 17732 bytes
SHA-256: 9ddb24bf0bdd7a754e2deab4d932a9868622dc648f2254a58b4ed77d33d67081
font_02_sfnt_off00013bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 10652 bytes
SHA-256: 9139d733bda54fef7ae8a0d75ad273520821d78f1e9522d4ba65489dd964fdd0