Malicious PDF — malware analysis report

Static analysis result for SHA-256 91732a4accb2bb86…

MALICIOUS

PDF

75.4 KB Created: 2021-09-26 12:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 61b8f94f6d824d48496b17cf2a400d8d SHA-1: 930687f902443d436f2d084eb631aa69fd6d5d7d SHA-256: 91732a4accb2bb863ec0d5c99239476f5c8686fdde4bdda7cbbb4995a16a3bc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=use+of+otg+in+mobile PDF link annotation
    • http://vagtteam.com/userfiles/Files/karibo.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/69494808421.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/80347691586.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/lobijapemamugagewewutu.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/7633436974.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/98519145549.pdfIn PDF document text
    • http://ipceurope.com/assets/file/rezuxamajakobaw.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161426e704c6c2---jejodulovajesidosusep.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/44615967628.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/vifexidefukejutiperebofa.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4fd842787---73945734825.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/pelixoziv.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///54574205679.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/sasiwaxe.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/bugazewa.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d726a42df6---nexuf.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/wobipuxanivobutuwog.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191893172814.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/22129385225.pdfIn PDF document text
    • https://intersat.lv/files/file/67113637875.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/diwuzatuza.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/kabudurepelukiturerudi.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/37496965651.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109021626035882.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/zakidizonut.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_off0000bf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 18964 bytes
SHA-256: bc143e2b01361c3613fb55ec6ad4dacad5f21dadc914581c3c79d75509c0a674
font_02_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 10444 bytes
SHA-256: ce2dc75a1db84ee3d6a7b272320857d78e4dc0e676e21a70e08c417251a7f5a0

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