Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc69adbcbd5f17c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 05:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6c0a107d581e3008e8bff432ebd2d89 SHA-1: 75a4680db407b9f18dcf1cf51346fb09a6fe859e SHA-256: 7dc69adbcbd5f17ce72325c4173b38d8a8f137f4a280a56ec2899b1f04272b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chaitraglaze.com/uploads/57876614220.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076499b11b37---56815837321.pdfIn PDF document text
    • http://m2m2design.com/userfiles/kinifudoteru.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/16517861365.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/79fea212cff23e6917cec50ae2fd9bbe/22444706360.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b8eaeba0---vemenopukezate.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/49419781549.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a479e84b---40149498380.pdfIn PDF document text
    • http://flexa.cz/docs/file/wixufigakafudadu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610cfc94e9271---nokedorutenupezesuvej.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xozawezeferupotufazetif.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/u3buhbacftang90b5lnd629b77/fileg.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/vulifudepusoropepedolanit.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/lenapuguseminasanabone.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/99532502754.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45a258d49---55658396524.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/doranulirogebasojirorod.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/61782175360.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/wololiriruris.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/36954015222.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/nalilefeloxibasasetu.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/83458346950.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/denewadonujo.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/33955623980.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/86453919384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=short+term+and+long+term+sources+of+finance+pdfPDF 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_off0000c190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 15524 bytes
SHA-256: 227de326bd03958f6d39def34a4442943f035b6dfa203462abbc34bc08f6fd51
font_02_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 11244 bytes
SHA-256: c16a9b88953ce2aaf9971db0e612fc9a1c80188a0201ffe038b3d975695c05b0

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