Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4565ebc0c2bf52…

MALICIOUS

PDF

89.5 KB Created: 2021-08-26 00:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f772d111f5556037f335aed99f3472a2 SHA-1: 254428258e5518d02655fc540a464dfd8e7a0cfd SHA-256: 9d4565ebc0c2bf52232cfb81ae2687fec7156259fc5149ed7b305ef52b7254be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains numerous links to other PDF files hosted on compromised websites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links to compromised CMS upload directories points towards a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d6fbdd08a---15308961183.pdf In PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3f42fa50---misolovugu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/s8sqofd9eqftr6j93r097b4vt1/sedigofekodovixalovozipel.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/wupid.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/55108946841.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/59200230736.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16123809fc5834---risomizifemufat.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/pegasiburenoxal.pdfIn PDF document text
    • http://iworking.vn/uploads/files/kilozigepibodenowezira.pdfIn PDF document text
    • https://rosycaffe.com/file/mekoxeremaf.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/le6hc2nev54v2kpd03f6s61lv5/75139120594.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/38876481512.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072736645a66---goferagoderer.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7t13hho94buos3mvl4j11to1ok/kaxapuji.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa52cd63c40---gezanimazoruka.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/rekurutixosudalek.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1dd19f937babbf36c1ddd7094995f0f2/zefemedovomi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dd42b2b74---65460287626.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e8ab42cc---84980332247.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705325727f4---kexasugowirolesu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fukugupox.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/pufapezozime.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/81834091880.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/592mubjpj01qlpi3gjodv4pho4/lozisolubixatiril.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/topagitamebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=all+and+cmlPDF 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_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 9800 bytes
SHA-256: 16fbf353add31a3cf715a858d23ffdabc9969a83f2d8b86dbfdad6e866d95910
font_01_sfnt_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 18108 bytes
SHA-256: 0230eaa3cb2e91dae1476639710e70c822934a2650d3678cca3f904baf530113

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