Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5eff99c936aa24f…

MALICIOUS

PDF

90.9 KB Created: 2021-07-19 06:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 82c07944b9e85c2af27fd62519207174 SHA-1: f125d35080532f65e00e9e348536fc1054694330 SHA-256: e5eff99c936aa24f863cc6f49444fcc28a9d425d642e63cd4eb6b226ac87cd1f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.bash.cl/media/file/3811198117.pdf In PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/wofamekozajuwelu.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/pedubisibivilepef.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/db9470d7703ba070665bfb643ea6da4f/92414945155.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fa43e775d---96420749772.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5e560333e2cb3463d61d51f39d57a4e1/53096951981.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/lekafajarodiwetagaz.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb8eace7b---96860510881.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/sazifuwanojajejaxesad.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/45552900163.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1624572864.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070641bebf39---90521923435.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021071304451681.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/13416948883.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/midepuxosol.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/gutibajarixikojekowik.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/zineku.pdfIn PDF document text
    • http://placc.info/up_image/90004449842.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160790c52c7de5---135035458.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/72084751087.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073036336c83---43848338760.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/m48nj1sbqufv2lns9l3eekbhr9/ketipabukidiwipituzelezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=disney+the+last+songPDF 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_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 10404 bytes
SHA-256: d626b61e04ed90b02356f8bb22643be8c9439aac3bdae2e1f6f85b6724e45801
font_02_sfnt_off0001326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 17032 bytes
SHA-256: bb6cb7d3fb34f7a6b13aff59794bf10e7e35078b284f3623cc8853386a4183da