Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f27d2b0fdb1b682…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 09:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73fa74c241956e017158c5fc7873f086 SHA-1: 33350133a74a191c085769a07f84be2fd0562038 SHA-256: 0f27d2b0fdb1b68221d5fcdfb10ade6dd6694bf1ad61c72e6a50950b424a3de1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=add+clock+widget+android PDF link annotation
    • https://alteanetworks.fr/img/file/jivamozas.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/10073139389.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/26761056947.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/tibagekobe.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136e29f1e768---2228178183.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/42661311621.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/47837710352.pdfIn PDF document text
    • http://youil.org/userData/board/file/fizewinememo.pdfIn PDF document text
    • http://client.diffuse.info/files/kenorudobuko.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/lufudodibubekisepuxugiji.pdfIn PDF document text
    • https://wildnaturetravel.com/File/64682909681.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/serufopipum.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/rubetamolasenopatezosob.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85023905870.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/29263945560.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/ganopamo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1d98906c6819ef039c38ff66a63deb62/49749975421.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/772de41ded1cfc045a52769793bfaa71/1354852893.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/34583685213.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/59175527322.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/vebozigedidopega.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/abf183cb23c0d66b875c2a4eccce2f9b/84458828177.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/11940398019.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_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 10536 bytes
SHA-256: a25316c2f329592d9eb0f3df6c169e2bdbf7676c038b7016eee7f2a15ca43f85
font_02_sfnt_off00010eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 17528 bytes
SHA-256: bd29ab187f3864eace65ff1aaf82ae9a13a909d105a34a26706069c0049a9345

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