Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7efda576fae12c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 14:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 646ead87d752f3c337673898ba27862c SHA-1: c977596563bbe103210fb7347cd95bd20f4e5fa0 SHA-256: 0b7efda576fae12cf80538726e51f4271fc8e1cf17dad85661362e68ec9fa7f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, the file exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/35191294471.pdf In PDF document text
    • https://walkandsmile.com/userfiles/file/29956538035.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/64270909826.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/xewuzazodejekip.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7299ea767---38536365393.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e8ec123fc161a1ddbfb4ca8ff6b8a795/82888415306.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/84863324798.pdfIn PDF document text
    • http://selidbe-beograd.info/files/75347568271.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/setulukevemanaguku.pdfIn PDF document text
    • http://adice-area.com/pictures/files/31840386652.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/tosapozer.pdfIn PDF document text
    • http://akconta.com/uploads/files/jijef.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/4060261961.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/18755638125.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/85706869761.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/698340713be29d5de528904e89d7f30d/23284104041.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/46244324627.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/pofekugalikotixez.pdfIn PDF document text
    • http://houselandia.ru/files/jasezema.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210902204343481.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/17044064376.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/20521138469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=goldfinger+human+anatomy+for+artists+pdfPDF 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_off0000dda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 11200 bytes
SHA-256: 59191fbf7328e26baa0f7df398f24a223b241c7755bbd30102b779b63a91aa0a
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 17512 bytes
SHA-256: 8423de7cd6284fa60d3c850ee170825140aebf3557a1c99c8942ba4d69800df9
font_02_sfnt_off000124f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1