Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76e9f5e2b8f9d5f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-23 03:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b391e0d5f2dcfbf93632326a78726d5a SHA-1: 35299cfd775762a4c0de3e5099f8f7320a231b7a SHA-256: d76e9f5e2b8f9d5fe9e74d5cc6cae3c895fb28afbbbbde040fc139de7e030ef9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs were found, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or redirection scheme. The PDF's structure and content, as indicated by heuristics, strongly support a link farm attack pattern.

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 https://archism.ru/uplcv?utm_term=film+streaming+vf+serie PDF link annotation
    • http://gramercy-grand.ru/files/file/zavomumadipoveterar.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///buzasumufetirobenerofikip.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/dofakepalikalamevolabixep.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/veleravitorujow.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/ridejojokufovidejusijimo.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/popon.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2960383710ebc91bdeb842470893c918/rewavilarewivog.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/33006646904.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbef356de---7275250009.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614731c9c15f0---41645224263.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/81086481821.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/90272657750.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/62359956207.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kovaxagawedolo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7638b1fa---rozikojetowufepo.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/6523788107.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/mujupunolofugisi.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50824350960.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/voluvezefega.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/butibalakidilolebesazewaj.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18b61bae5---61609204130.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/popigedemebuginimagir.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145345044fa8---zubopomevozozu.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/nerepeforipunilagaxa.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/2915833047.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_off0000c38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38F 18144 bytes
SHA-256: 9cd36c4bbb7648952cb21a8b6ea727facd7f1631d5f17927d3b43faa2132e89a
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 10480 bytes
SHA-256: 8b54f46395fce4860cf9307c07fa825125dc4a544af2a9405ec36a571dc4c393