Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54324b9e7b13335…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 01:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c6a863b25f0492e1be8a71e50e65af4 SHA-1: 47fdee5e6b74e4a8d76c3c587154b8b9034c3d53 SHA-256: c54324b9e7b13335ae097d3e10b0604068b20cacd3dd2be46357e91b357bcdde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The primary attack pattern observed is the use of a link farm within the PDF to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://faresaldabbous.com/uploads/files/97024160416.pdf In PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/lapixusalulojanifogor.pdfIn PDF document text
    • http://mebco.ru/images/file/kobebabevero.pdfIn PDF document text
    • https://apra.pl/files/file/82422510008.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161389b2131897---jemavetumafunoka.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/82388572285.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/wodoxaboxukenenekuzifu.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/30094600942.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/kalegilarowenigejuvi.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/wogafobupegetov.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/89aa3d1ff4e5bf5a4d4f5f7bd98c78fe/moxelojar.pdfIn PDF document text
    • https://plasy.com/uploads/file/60464966725.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/ziwowa.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/ralijigeb.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e9b3755fe---78761578259.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361907f4067---nupaxurix.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/75022319549.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/24775140734.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/nabegoliso.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141124197f63---wokatome.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/9608058480.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/fevakopedikalijodepa.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/86354562374.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447d15c7c49---79506241320.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147aafe46fce---zutapexurakitovikujile.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/tipegejorepodudemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=supernatural+season+7+episode+6PDF 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_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 10776 bytes
SHA-256: afeb833ee5115c8d7a829d656bdbc9989bdc6cd7032176576917543e319b45af
font_01_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 18316 bytes
SHA-256: 209387c0c5cb1ae281932b614b6c4c7f03cba1bb3d1097d904264486d6d4a6a8
font_02_sfnt_off00012b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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