Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2fcb2546298ced…

MALICIOUS

PDF

71.1 KB Created: 2021-08-29 02:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d31f7a0a0ceb70d1e8c0c4cb1293e383 SHA-1: e6dbc905c0fe46b3c2986e4da3a76d549432c051 SHA-256: 9c2fcb2546298ced316dc58b4eea0d181f569cec9cd4dc0a1cfdac0036396d13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.gleason.com.au/application/third_party/ckfinder/userfiles/files/44155284119.pdf In PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/27890968603.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/n926d71aih7varm1rboktvhed1/nebolenigakenavugib.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105101638.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210804180304.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160812483b19a7---wesododil.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f18ca62d---xogezolakuwitaj.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/zofadamidi.pdfIn PDF document text
    • https://paradigma.bg/uf/file/memoxozopasib.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/10596402173.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fb7f1520f---22822657599.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210728012733_62z8zk.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/82274191617.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/79726752829.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/felusegi.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/9325495236.pdfIn PDF document text
    • https://nicosiacaffe.it/file/61591239158.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/41f4d392638bc7d05b7c39ae85d67767/80574106544.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831d9119c5b---11988743735.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/9p44ue7a51lqs415cpmg55ajai/32804177781.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/77235326529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=electricity+and+magnetism+griffithsPDF 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_off0000b84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 10900 bytes
SHA-256: 1e4ee87c02534b65ab365736f28de603868c3fe12b1245dde6186abd3c63f485
font_02_sfnt_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 14656 bytes
SHA-256: aaf40a12f53a2f4cad1e91b8dc30a989c89bfcfa30dcd936c8102153ddc9cb21