Malicious PDF — malware analysis report

Static analysis result for SHA-256 b489e4bff553ff68…

MALICIOUS

PDF

73.7 KB Created: 2021-09-28 19:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1050e3a38c498048cc8863f317335a7 SHA-1: 127bb2f8327fd3fc4e59ef2410848e3b83e435a2 SHA-256: b489e4bff553ff6824e206969af3db0b8a701d90ad618ae176b9b144032f33b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it's designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure as a link farm points towards an attempt to exploit user trust via indirect means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=fifty+shades+of+grey+hotstar PDF link annotation
    • http://uzks.hr/upload/datoteke/34595646724.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/juxilutisur.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/sipanote.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ca11e1c89---fupupizufup.pdfIn PDF document text
    • https://zzwgjx.com/d/files/29694276159.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/waradugipevovuwerusububu.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/84307281988.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jabitilizesaba.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145340e8b4fc---nadokaj.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2d375e6e0---95891519583.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fafdf63470---25039957018.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/jiwojamavewudemiliwoda.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/78329929597.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/34888225887.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/3569722315.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/35322033932.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/ledojopatalo.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/43973475103.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/95934868705.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/janekutadukogejukude.pdfIn PDF document text
    • http://irollee.com/userfiles/file/fisapafugin.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/98347024196.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/xububidolupoxilijovu.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///kidewuna.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_off0000b6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BF 19560 bytes
SHA-256: c12677038625f89ad48064649d36eb980fd55bf612cc45c5b1589169a2524742
font_01_sfnt_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 10572 bytes
SHA-256: bd1d4af3530fd9a056d163ef99da8474a74a364f4b1505fec4929ce7fa095311
font_02_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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