Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd42da4ead1b0315…

MALICIOUS

PDF

71.1 KB Created: 2021-09-30 23:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16b7931596b70487ed75369881f120ae SHA-1: e2d8ebc0f4e4302589f5e389d86ae9cef43fddfd SHA-256: dd42da4ead1b03154a6d1ba4355e8aead90a6c91f2fc9472f77a1eeffa2f52b3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, with several pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs point towards a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://avigailpekelman.com/sites/default/files/file/torat.pdf In PDF document text
    • http://wittlich-luexem.de/userfiles/file/67128275458.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/kaziwovidoged.pdfIn PDF document text
    • http://klemanpince.hu/files/file/zagaxameped.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/10417152429.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/36462903581.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/n34r5m2n6scbmr7gj8oevkb5lq/90905142030.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/lumopuwiwupuxi.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/46906426934.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/41098750595.pdfIn PDF document text
    • http://www.toptehnik.si/images/18716731708.pdfIn PDF document text
    • http://capital96.com/userfiles/file/wujinadegari.pdfIn PDF document text
    • http://greenld.com/userfiles/pokibekojikibu.pdfIn PDF document text
    • https://chothuexeninhbinh.net/data/dulieu/files/62750367443.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/a2cmvuulj5n8ihirvpoljbpok7/nabub.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151848ada6d8---xulebuleviwikapapenizoduz.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/11655747574.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/73010904176.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/67309387679.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/xeragin.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210927_18BFF5760DF7B313.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/49754606445.pdfIn PDF document text
    • http://htwy.com/upload/file/dodofopirisibonemapaf.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/laroravumotosuzujotuvev.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/vuzod.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/rokikabazir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=where+can+i+watch+groundhog+dayPDF 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_off0000b4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E6 16092 bytes
SHA-256: c9f32bb92512aad14c45d9069872696fcf6d24bb36804a89f8d71f09eb71a643
font_01_sfnt_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 10728 bytes
SHA-256: c80c15ec649b6993421d8a0596ff1c86c44a3ea50e4668a1d52caaf805faf14f
font_02_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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