Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2dbfeb32c5f60c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 15:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31795f5f09b64f6de8ae8d9f295e2b6b SHA-1: 1fda62b55002ed5278f29e0356a27783aaadf2a2 SHA-256: 9a2dbfeb32c5f60cff5b68aab8cb365c90760708d3f29387ed7644f4de616a4d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to domains that are either compromised or appear to be disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ML classification and ClamAV strongly flagging it as malicious. The primary purpose appears to be directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=sociologia+fundamental+norbert+elias+pdf PDF link annotation
    • http://gowowdeli.com/uploads/files/zerifapesorubetagoda.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30c032b3f---debijiz.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e13b52df---wasuvoporofaruxixipipovax.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/jazifovividotoz.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bda2b722a1d---pitisozu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/s2kglnk503fidcc4t60hjkev78/23437058574.pdfIn PDF document text
    • https://carlojans.com/cms/file/fuxilosijazipidagawasub.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/kunafumupugem.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/4e7f9a4c8c58c8b8f6df3eb8367dd163/27752148604.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/memubaxinesipo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16303fa03---nirumegapevo.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/xowawigajoxikixos.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/621162a9aea10004d39dfdc7d7808291/68031066235.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10a023907b---10362685371.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b0e384fe533513a2e70afe9c6f21596e/vurasunixu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b11bf378d---wilepinuzezo.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/81377123310.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/veletixadareto.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/69519541999.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f95b9d1---4411597722.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/sagilupubanoligozad.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/sizojizurifavijifisitifof.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_off0000b642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB642 11280 bytes
SHA-256: dcfad17037006b1c449f25a6185b3880aada256f02c5fa9f8ecd13e25290a663
font_01_sfnt_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 16604 bytes
SHA-256: 7535cb13a658341cb47fb40585d291ac2931cc7b0ed7dd5394abad6129c8c137
font_02_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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