Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6c4daa0f494228…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 17:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6714b7b29993aebdd4d1a4caa897c05 SHA-1: 0efe8fda50bac210e4e3688ca1c1014dc5fd1287 SHA-256: 2b6c4daa0f4942281daf2e316f3d5e8f047c4529f0311776a2944f3cfaff6fe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URIs. Several heuristics indicate the PDF is a link farm hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=zero+and+first+conditional+worksheet+pdf PDF link annotation
    • https://altinhediyeler.com/calisma2/files/uploads/77743089220.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/11357490751.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/12226396735.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/24996095409.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/32219183696.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/89357826718.pdfIn PDF document text
    • https://hitelesen.com/userfiles/file/68631716372.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/wifujetezasezofesitemug.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/gogoluvamo.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/27989962692.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ogrh14vvlha4bmlpr78ku96rno/52733853137.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc9d930f6---32523903709.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/26406858305.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/96157519876.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/46787012729.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/vorefikenaxakuja.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/bezarotadini.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b460896404---todurazekuxoluvaz.pdfIn PDF document text
    • http://mc-opony.pl/files/file/morenejifabofabezukikewox.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/43289213650.pdfIn PDF document text
    • https://salwangurugram.com/files/rimajawuzunij.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/zajujufejotuxarixatowexuz.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/rafosiletuwugujudaduleko.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/78698076968.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_off0000b28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 16128 bytes
SHA-256: 9b27d00a1d8856dc91055f923d5de33ac3d89f77f8abc57bfb10be3b915e6df9
font_02_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10856 bytes
SHA-256: 120e26910fe0525932583c38a28b69622c8277a4c065f090cc2e5a8f584e4fc5

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