Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2bb77eef1482b3…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 04:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8068d921886d35e564ad072e7de3e68a SHA-1: 943d4804742394004aab46d158ad57d9c138f10c SHA-256: ff2bb77eef1482b3ce482d0892d8d042bcd9ed0d360ef890a5f7a0d7fb090fd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://janjoling.com/public/ckfinder/userfiles/files/rupekavezagufufofof.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434694ce6e2---neboxiboravuvejazigo.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/12476068610.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/jujidozub.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614d16b041de2---65980236630.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/57161458513.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/19151578745.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/xukid.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/mojomuse.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/pasatu.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210905_6A85AC12DDD446FA.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16150334336e84---juxiraporekixefiwujus.pdfIn PDF document text
    • https://longhoang.vn/upload/files/70679430442.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465e00d33b5---50063007897.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/gevesexobebapik.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/39202321980.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///dimureweforitilediru.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/kusutilujojenepozofogub.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/81471779942.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/gajik.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/jofetawewupekudorifa.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/26992429612.pdfIn PDF document text
    • http://aromata.ru/upload/files/vonewiralunarenategeb.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/63462740920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=difference+between+independent+and+paired+t+testPDF 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_off0000b0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 16404 bytes
SHA-256: 5416b9598fe344f4841684f01d9f6b98fccb5c406a7d37767d1a422909963600
font_02_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 10676 bytes
SHA-256: 5b307892bc125b4df94be8813de178f19233e695ea41ddd6b4358f2b0acbb99b

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