Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd67daeaf8da7487…

MALICIOUS

PDF

74.0 KB Created: 2021-09-30 20:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b20c33e9b5cc7fb4a00b63ec68023588 SHA-1: fea1f7f9c185433a7162ab8d5e2980bba08893ee SHA-256: cd67daeaf8da748716689ca77af76eb94554ab7ce1156aa46999a0d7f5b95c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is structured to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=english+file+b1+fourth+edition+download PDF link annotation
    • https://investmentskillsgroup.com/images/userfiles/file/92929206633.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/83712183307.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132d54db34cc---84004655810.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/buliwuworajexufikozebu.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/2275502097.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/busonulufedenap.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/mefowibilejexumom.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/54720208968.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1632691072.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/61414218263.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/68768258391.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109081822209261.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/95721015227.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8f8b339dd31d388dc16e376f0a42bea8/nizitakagu.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210902_011943.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/49471592662.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364dbb57210---60919081060.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/mufate.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614453bc36e1b---zuvuxezamisuviwolot.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/81166843609.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/tixezatuxilu.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/laroj.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/21831547546.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/89264001752.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_off0000b7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A6 19480 bytes
SHA-256: 8ccffe4ea5909c10eaa6a10c001cfcff1d3976b38344459096fb44c0f7ce5eb2
font_01_sfnt_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 10996 bytes
SHA-256: 6b9c393a3028ed19bf3c71a6d6f5cdfcb7839f972332524eb0f338c8a3a856cf
font_02_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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