Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf7fff5948e847d…

MALICIOUS

PDF

85.4 KB Created: 2021-10-14 11:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 847eee280cd743b73fee10cd2ae3070f SHA-1: 1ba15d31acd7a5263709c5ab3848a9af9d4b9d8c SHA-256: cdf7fff5948e847d08cec50d486e422ef4bc2c510fee0f65afd34d4ee9a31998
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ecohort.com/userfiles/files/mumevegokekopigevojoxexa.pdf In PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/povefebu.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/forubefugadikanatanesu.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/jetoravuziwoleja.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/rapif.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/9715638273.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/80127087510.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/713bc242f2d63e6902fff4e72fc8b085/jogur.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/wazetumad.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/88667819377.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/61162461601.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/54699558170.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/fopifuxuku.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc29e4547f---27582183024.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/zoguzudenusisu.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/cb044ced75874c582d99205a09ef199c/fenenelamogotoxepi.pdfIn PDF document text
    • https://estoniapools.com/contents/files/77326661327.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/82358587675.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/ginemuvajazepofilesokujuf.pdfIn PDF document text
    • http://rld-carbon.com/file/35057566939.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///maxekegirowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=why+college+athletes+should+not+be+paid+essayPDF 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_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 17404 bytes
SHA-256: ecd356f1fab515516a90f84ae1f767e5bb70a0fa005a1e32ef6d859035ff8e45
font_01_sfnt_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 11040 bytes
SHA-256: bd550133ff2fc84b8f403ea51ec623516f3c1eebc5d4b06b1d7c5a72502bd10a
font_02_sfnt_off00012f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1