Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b4ac115b971160…

MALICIOUS

PDF

125.8 KB Created: 2021-09-08 07:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9cd2835bfcba1c40650c30771f2033fd SHA-1: e7e0eaa216334614bf41c0a223f60db1c78392e5 SHA-256: c6b4ac115b97116079ed42ff1fa233bd4671567dbceb3a7ceb6a41b6be792a28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or drive-by download attempt.

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 https://crysiq.ru/uplcv?utm_term=osteoporosis+treatment+guidelines+pdf PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609236f8461d5---86056981840.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/284c0f4ed7acaf41bb8563146131ad9d/70119759066.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/45237751207.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/013b26a9dd79af657086a087d98f9966/31228297820.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44fff41bd4---zatojebejuvelun.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a69255a5501---varegagup.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab790dc9695---66770555873.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b463423f925---93568020779.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-07/images/files/16098350412.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/35251706314.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3be78121---nukenaz.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b285db1a6---tafalaxanasewu.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/91996275132.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/3346177167.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606da48e1fce0---jubarofadol.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa200f864---952237174.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/susuxufok.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/wakujemekapuziv.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29b5fd486c---74749371859.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160836312c0760---7511133060.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/girujib.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/pavuxibupaxe.pdfIn PDF document text
    • http://jngf.cn/files/file/25238136758.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bfa331f94---32313510587.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_off000183fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C14 10968 bytes
SHA-256: f269443f13c508736d1fdfea7d986b6e8ed1bdfb6a457af218ad4d868199f7cf
font_02_sfnt_off0001b54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B54D 19812 bytes
SHA-256: 67ea54d8a5c55456a9aab08dcc5b041480c7200edfc48315ce52f1945ad381f1

Open this report in the interactive analyzer, or submit your own file for analysis.