Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6ae62fff1667fa…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 15:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d29575df683b758f4ace745d7e64607 SHA-1: 3f1c35c61233b9e3f5f21c142ae02a5af49047d8 SHA-256: 7c6ae62fff1667fa35619a684b06155cb13c11d38fd8f8b6c4eb094ab5ae083a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter specifically flagging it as a 'Pdf.Phishing.Trojan'. Although no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=teach+yourself+piano+book+pdf PDF link annotation
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vutexubajugepojepokofaw.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24d02825fe---79932138001.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/79894620825.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c054c0adf90---zofasil.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/93487163084.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/t5ir3fo5aa8nt497k0f9ufovk2/57268776906.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/xunediwabekugovudati.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210624030033_alrlfv.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/90691460169.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/vadebotoriratelo.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/novuruniga.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/25128434848.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/248075e17676ad19c4083f9c0d7e8674/robuzutolivekem.pdfIn PDF document text
    • http://palcev.ru/userfiles/file/24313769448.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16126d7c5a1d8d---56723512355.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/54634954420.pdfIn PDF document text
    • http://checopharma.com/upload/files/wufejav.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607234a6a809c---6610068701.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/63440177189.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/kaburoxate.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c93ec0e4e---zazaganepug.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/32318983825.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/motogulijanekega.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/56011003a25193c723940cd15a27dd4a/biberuxipa.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/74429769158.pdfIn PDF document text
    • 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_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 17112 bytes
SHA-256: c4b881b8f8789e2a6500f7c79cfc549cda5e5f1e9f86c325f8f4b174de0bc223
font_02_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 11028 bytes
SHA-256: b29df94e3f015de5c595c614b02cf0d0a8dd9ea580f17d0c01e8ed637eea5f0b

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