Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2c878e87aed98b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 10:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b92fad24bf27351162b70d2bd98b7e3e SHA-1: d75d9e642d2abe9990bad62b90450ab2ce486fcc SHA-256: cf2c878e87aed98bebac6cf68816129b582ef643c6da27a7b7b8a3bb722f14d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting it's designed to lure users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' highlights the use of compromised infrastructure. While no scripts were explicitly extracted, the nature of the URLs and the PDF format suggest potential for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=swipe+down+notification+bar+not+working PDF link annotation
    • https://nulifeus.com/~nulife/userfiles/file/sexuxiwedegemigiju.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/46375410971.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/lizuwipevan.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/23645569506.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142153cc8c37---ziganuvetuvefexewefekakax.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/38731318003.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/63278082090.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161428d6be6bf1---redilejowexomefefekev.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109180621416369.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/24975762744.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/73321193879.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/93970540859.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/45012817471.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614659d161485---xijajadufi.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/deribowoxetidasadolevele.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/55659847040.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f820d9e71e---77477310674.pdfIn PDF document text
    • http://carszana.com/image/upload/File/31489446464.pdfIn PDF document text
    • http://airsoft1.ro/files/file/2722065883.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/miwosimaxulegovowifemolel.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/5331204147.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/bapipivesaj.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_off0000bb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB31 15448 bytes
SHA-256: d940f084e1a68ec8861985e984720f105fc6b19488085ebd5350b28797bfa1eb
font_01_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 10976 bytes
SHA-256: 686b617d30f2673ecd10b8f2f15c41335c234eef0f4f0e4486f6f9bcb4cc804b

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