Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68d80a07572fee6…

MALICIOUS

PDF

73.5 KB Created: 2021-09-18 21:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2db255b29759ea30be29291a54c118b5 SHA-1: fa35688fde071959d7cfe9f1da8f27e5801afc03 SHA-256: f68d80a07572fee6354c9b5f6f99a13a1495ab9d10bb6ba460629e820a0bc312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://avukat.dnsaktif.net/upload/files/wozitomogosovurij.pdf In PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b9764de46ab8d5eeff3c6b8f46e3d25d/65195602136.pdfIn PDF document text
    • http://popeyebio.com/upload/files/gareforisifuzozifise.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/18448789500.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307f0f105e3---damobileba.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab3ef0ca5---tuzunov.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/vetudefekasuzifotogerama.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/giwito.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/62599780700.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc9d80c74---lixisekuposopiranetigas.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/veteluvevinovozobunekemem.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/ritigiseziraxirakifaw.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/wuwom.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/4635799885.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161396d328b487---tidosofoseroj.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/95236999303.pdfIn PDF document text
    • https://kham.vn/userfiles/file/5439205932.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/pogogumarixuwurekupo.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/26690683251.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lesomagefumelotibefifo.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/wovaf.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138325688406---devakemodezu.pdfIn PDF document text
    • http://surtek.biz/image/files/20150331_232641.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/11384127453.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/sufininewo.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/gitufivikixamareral.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/77845565826.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6f8681cc---mulumemejibasogoxufanavil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ipad+pro+v+surface+pro+7PDF 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_off0000bf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF53 10440 bytes
SHA-256: cb441b51b05dacb5865a53edd6093c1f3dafc3d96f6c88505d298bfdb46289b5
font_01_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 15904 bytes
SHA-256: 15ae0fcc92f69a363d9393ccda500587249836bc3ddcfafc8d43501176ebfd5a
font_02_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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