Malicious PDF — malware analysis report

Static analysis result for SHA-256 673a7d85007e5cf5…

MALICIOUS

PDF

100.5 KB Created: 2021-09-04 22:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf46ac52ba96f3c673a41fde79473c06 SHA-1: e7186d66762a5fb35d71520900e125dbe0a41d11 SHA-256: 673a7d85007e5cf590352f8185bf6bbd1f96b794077abad8d560089a34bd18f5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure and URL patterns are consistent with exploitation attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d54543e26---4427494491.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160722da3bd0ee---jazezabididolirili.pdfIn PDF document text
    • https://eetravel.net/file/48777362735.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/mutubofijowewametepajida.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/322a80piigh62c1rucqft4u3pr/fotoritikib.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9444020efb---zudokupanebawopoviwujuw.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/bajobazotomazoroko.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/84372320814.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2f0f54606fb9746d16b5504eb7b5a439/zaxoninunuwanedi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160988af26919c---73060793676.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/vezinogoxa.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ef5571be4---wopulusiburirekavojaxuz.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/fabimakesagawexol.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/90582829476.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b345a50101---17165653790.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/nijorogusujifis.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd30b666e---27059856342.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/7do07ipbn1okstrcmsk2bdqmom/jutizojetene.pdfIn PDF document text
    • http://mousike.it/img_ins/files/jajepabapedaj.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/40827810440.pdfIn PDF document text
    • http://schokozentrale.de/idata/tudefexubitotofebaw.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb80f1df40---67276896786.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/vatugin.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/89a5c4c9ba761f7882344968a4d5cdfa/70590013757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=deadlands+coffin+rock+pdfPDF 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_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C54 18648 bytes
SHA-256: 434ce344c7775b74822a333fa43cf9cca9eb2484bb3e0852850081b74087e092
font_02_sfnt_off00016c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3D 10608 bytes
SHA-256: e3304edcfd7a699f935894b0404ff62b89230adf6a0b4dc2ab7e86416ba9846b

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