Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ca05c8c5bf8d09…

MALICIOUS

PDF

92.6 KB Created: 2021-07-15 19:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 772b7c347fec282631f34e0fece72ac1 SHA-1: 115791e3ed2fee9b36d7cab796944e4334acd440 SHA-256: c3ca05c8c5bf8d09eec1ce80a897fc156459432b015a288b6132479f32fdbea4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The file's structure and the nature of the URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7db31b951b5d0270b285beb2598251c1/kadetebisawitojagebow.pdf In PDF document text
    • http://airsoft1.ro/files/file/55953441044.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/58365731166.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070aba14b1dc---kipumavuvesamafinon.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/nadafasajew.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3eaac9474ed5a534adc2e90b3c571269/xadumusokaxademojajo.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/kobovuxomosumebodesevibo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e02127cf5---lasofojurojajovupodezuxa.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f58c3efc7---kawipebuxovimafedu.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/cee1bac5ded8e775565f1c3698a9e345/bapojomif.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/wumekameg.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/7894c741863c7f7742a0fab756f6dff7/tuluvewizenigegok.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/853235e63b5159b577576e2fd2f4134f/96767777850.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/xineputenipidezotugepidu.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/88594104570.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/peduzudipifogajo.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fed562aa62---48644900855.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/fda53439bee042500d49227066706387/5416695310.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/munokapejikorutokewenere.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/vetidenaxugitiderimin.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/1uiv2csr215h5mhl340rfu620o/rapometezuwamifax.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/055b166daf8d9b63eb7a71f77d4c7ae9/jurijaruxileviveti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=american+wolfdog+puppies+for+salePDF 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_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 17756 bytes
SHA-256: df945b85cea97c3deccfc59cec2953cd7fd4dded56bc117ed2ec4f89e4ae7278
font_01_sfnt_off000133c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDE 11032 bytes
SHA-256: ea975c6a6054ca8d43ce524ccae15de426c2c8ef6c9bb8a4c090734a45f10b97

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