Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8852052306bcac…

MALICIOUS

PDF

87.1 KB Created: 2021-08-26 11:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cada2f358be34a35cb3cc6d9b6d1e5f4 SHA-1: e249d93a9d555f5fcd78efb9436243215d7e7477 SHA-256: 4c8852052306bcac5f22e1ed9e4ecdd2c69eab1e11184e75dc7a1a57e7f3d30d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely designed to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://russia-ex.com/images/blog/file/nugatogewuketesimu.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62d6ec2fe---75457909141.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/nuxutomenavovuvavivezu.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/lalaxubamewe.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210825162208_56gv5r.pdfIn PDF document text
    • https://stopserv.ru/files/file/36494440115.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c9f64437069a8d989d91c596528b8afc/70235815846.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c777927f1---foxuzi.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/1483762463.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6956242c8---bakuvegiz.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/54b4092b82971cd3ac33e6c6e308084e/59351050002.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/94381215270.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/59844904009.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/85006511630.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/fozaxa.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097107919092---kofasovopa.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/59741683605.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/30283869058.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/49031787663.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/843271595.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/refatanujupupurelafimu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/660d4f4f49157e54735cb844af4bee71/wujavixozodo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/69452804240.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/96118407093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=letter+to+england+postagePDF 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_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 17764 bytes
SHA-256: 1e139695580d39d10cd8a4923a5484cad1c40e5a6e4be2d10437291cd3c8b86e
font_01_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001373c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373C 10432 bytes
SHA-256: 3b9e51cd54048bc7e79cae83b5b4a3af1817a75417c19a640c1cedd81db63be4

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