Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f7d6c6ca2e48d8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-24 08:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78de93ca08064cad189b2cd252acbaed SHA-1: 202b69e2658fca1a389dc4308ed36e5a7f559b65 SHA-256: 07f7d6c6ca2e48d8ddc30d2d3c56e47a3ce69e0978eaf27260a58c35a8978f1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is used to redirect users to potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=naruto+senki+2.0+mod+apk PDF link annotation
    • http://jfe.hk/userfiles/bumeresamulewu.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/tezosilimuxinub.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/36667924523.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/futof.pdfIn PDF document text
    • http://konzolstudio.ro/uploaded_files/file/duluzexolikisox.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/37815743191.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/1114115177.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/31351115244.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be3d5ca810---punuverozositarul.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/50048407993.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/13558316426.pdfIn PDF document text
    • http://synfarm.com/upload/files/47397500983.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/warovepu.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/85495953619.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/73194528596.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/71715782522.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321f3035466---dozolesakov.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/zudivojemafavu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/62021938530.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a3a19bb70---xaxati.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/demabasad.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109082348106715.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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 10984 bytes
SHA-256: 3a26768e708655c050481609151843dc89bf8243749c83121ba22747a43d5f44
font_01_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 17532 bytes
SHA-256: 4de6e1ded0cf133770d36ba723a45ea03b8b49abcc782014380b838de67b33dc
font_02_sfnt_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1