Malicious PDF — malware analysis report

Static analysis result for SHA-256 f307386133d4ff66…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 19:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca2cc60f9faf1605fd94476a4fd1ec6e SHA-1: fa46bebb5e73ecc5b7360e70f887574a49cfe4a5 SHA-256: f307386133d4ff66f22dd29013fd44b078496aa985b2352448da2c4909d81dc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, disguised as a download link for a popular game. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload. No scripts were extracted, but the structure suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://daaeportrett.no/upload/file/77339510760.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161374abcea9c4---makudonivenemef.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/lelem.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/45022616259.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/roxibinosebekar.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/badukoxovilu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/kafavixilabebi.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/wibujanimukujojiwomupixu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b7f2cfc9---vutubezamu.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/17270283176.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0f030ebea9687f19fdc2d9de118a1de9/29730571363.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/61777481992.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/66oh16gsm99aaalri1ne2ku4s6/lolijudojotigoluzu.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/sepatupefazafef.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/12454537963.pdfIn PDF document text
    • http://zaiger.ru/img/file/55575739488.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9f9c176f---xufolas.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/52633230364.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/53518613496.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135930f02705---8664931725.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/89213346734.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/14451579460.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/vifufunokebuxe.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/resebadujurabufaz.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/jeloribexofanelonigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+among+us+pc+freePDF 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_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 16788 bytes
SHA-256: c6768a99206017c27dfc0148e7e6ef1caf0322437cb5008ad0f0231df1d9a28c
font_02_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 10960 bytes
SHA-256: 31ed277b9e059edf2d975001c8b858f4679dc697d5d73db9c4da73b572e757a9