Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f7f1f799381bf9…

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 11:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ac903ac506f341d1e75f8996af3886b2 SHA-1: d2c54227812b6976c3b87ff5351b394e7fa67cfe SHA-256: 94f7f1f799381bf9cd29be9305e2d8ddc4205964d38f1388e7d7722f0a446e9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://jiendurancecoaching.com/ckfinder/userfiles/files/bogofanebibil.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133838081413---59724804614.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303da160b5a---nekugivitow.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/17747450492.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/rotapopetuvapusijufukuv.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/21900623126.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/34123448596.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/jisinadesukilukubage.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/ronewetejatibimam.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/89424008380.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/88655538123.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109030632498507.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb2225756---29953454824.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/18033496941.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/patupafevejabitelekezalef.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc38c2518---revokukupewetosusuxu.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/zipenusefexape.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/kejexemu.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vixepozop.pdfIn PDF document text
    • http://epicridesnepal.com/files/fimulimigafagajatavegolo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/6i6jej5pc7b321i17v46gsc7or/tonikixinagutopepob.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/waxidetubodomi.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/duson.pdfIn PDF document text
    • http://geoman.cz/data/file/gizofamor.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/pipafikigove.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219101551519187.pdfIn PDF document text
    • http://bwc.lt/i/57925796439.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/budasebijexumumapageju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=%D0%B0%D0%B2%D1%82%D0%BE%D0%B4%D0%BE%D0%B7%D0%B2%D0%BE%D0%BD+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8CPDF 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_off0000b6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DD 19252 bytes
SHA-256: f09f8573f044741bcdf10d813ea76cf1cccd27b9592f9fc2006c76bb685b9b98
font_01_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 10552 bytes
SHA-256: a1a7ba67779f7a2e761dad24108248b21273a15b2c5a973e9282c405db5a84d7

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