Malicious PDF — malware analysis report

Static analysis result for SHA-256 7652eaead51eeba7…

MALICIOUS

PDF

86.1 KB Created: 2021-08-05 09:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e51348885591610281c2c5a492d57ac SHA-1: 8394e9cbb9a527b4f44d98186d71060ee236400b SHA-256: 7652eaead51eeba7cceb29b11fc68eeea64868c6880d22212a5cc39223686de7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to websites hosted on compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/crh9954ioiqjic52dtptop4d70/kewejajepajedegojugupajo.pdf In PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/aafb6cf987a17d24c957663d3a6a076d/87590273473.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/tapejoxexuzanimofi.pdfIn PDF document text
    • https://ghnservizi.com/file/giroguwike.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/banuvojeriwojerase.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/lolilopaximagaxunasug.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/supixewubinageduduxinibis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19edd050cf---dusoxa.pdfIn PDF document text
    • https://chp-travel.ir/data/file/vekazusuxubole.pdfIn PDF document text
    • https://produsedecopii.ro/app/webroot/files/userfiles/files/26410857986.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28152683351.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/25823916483.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/28217387566.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/redonenuvolutuken.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/69073504403.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/60085006403.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8hpgera3g0jhr5fqed52hbkvlh/metixekuwezila.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffcc517891---xakobitosezobuvajimedener.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76212359f---62238557816.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210605_75568442D7DAE942.pdfIn PDF document text
    • http://fructusartis.com/i/File/zaporogigotabopim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=questoes+de+termometria+enemPDF 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_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 10524 bytes
SHA-256: ec421118fe69574ef64b562c41f8a3ad4dc5cf69152c55f078eb17ff53f9feb2
font_01_sfnt_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 19728 bytes
SHA-256: 652ab53485676987b466ad4cfbc9dc2668bf9d2f25b1d623bd98b0bac2ac9b78
font_02_sfnt_off000130ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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