Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a52d231d46cda5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 08:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a9e94fd98a862a9103539ffb87be18f SHA-1: f57a55fc7a366c5c4e094290d8f304d40e884e10 SHA-256: a0a52d231d46cda583fdccd2bc99d07199c7c9acf58721525ed399090ed4826f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous external URIs, many pointing to compromised WordPress sites and disposable domains. The embedded URLs suggest a phishing or malware distribution scheme, leveraging these external links to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=project+topics+on+environmental+management+pdf PDF link annotation
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e005c10ba---zasomorovusezubabesukud.pdfIn PDF document text
    • http://coumert.com/images/file/jovodadifinusufisofuku.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/49651094080.pdfIn PDF document text
    • http://sns.hu/_user/file/kotep.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/vjkme5j01od7eap5g8fg9h03jd/fananutazudeguwugezij.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/wuletowugemijasizosir.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/90005789331.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/81119454972.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fakipefekubinanol.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/iujqhnm2fsmbqpnoheuquj5u7d/buzofedateza.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/77253550763.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72f6c0bd3---napunerisagepaku.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/72967551830.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/laledomememijogafuji.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/rupepologadakitewetibisig.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/18462518872.pdfIn PDF document text
    • https://triosms.com/userfiles/file/rivifinagixijim.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97b40a1af5---delox.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/nodunudizogovufigapek.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a3928086e971d33569eff069fbee8bb6/duwefized.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/33720088363.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078113643f40---13069871395.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_off0000ce95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 16644 bytes
SHA-256: 5af8eaa00d700871465b626a10391df0f4d9e9dddd4970eb9706ad96e72fe3a0
font_02_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 11160 bytes
SHA-256: 1f4bdc9082d7db5441b98bf1752ab5d6ac19d6376e56cc677f1d032d7175aff5

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