Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99a99ce2117e3dd…

MALICIOUS

PDF

88.8 KB Created: 2021-09-04 07:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9eddf89d722d2f48cca814c52f74937 SHA-1: 7e4d5493733596ef9c8705ab751aca410590f3c6 SHA-256: e99a99ce2117e3ddeb9715b7d5e1dbded06d249fb166abe54c18aa165b7931d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the embedded URLs and link farm structure are sufficient indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b24b46ad0a8603691ce8fc65b9e7e9fc/77101049550.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f74344e60---6600131877.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///wewexemotikokutomanup.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb49990bd1---88891271357.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/zupanal.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/ruxetor.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804af81939d---14011617108.pdfIn PDF document text
    • http://packturf.fr/files/vujagima.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100c41548e64---sajefubirususuxuruza.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/54821469418.pdfIn PDF document text
    • http://warehousetraining.ie/images/sekogupogetometiti.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/lelapisefa.pdfIn PDF document text
    • http://ave-france.com/pics/files/bujukukogawatabote.pdfIn PDF document text
    • http://fructusartis.com/i/File/78352982589.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630217855.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd01ebf15c---vefaja.pdfIn PDF document text
    • https://kaisar168.com/contents/files/guruzifikozar.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/lefidosisowol.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/612b664092a29.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/40168842039.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0c3ce669aa7841157da74bba7396e6b9/zewamakuwevakilelege.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/83296538552.pdfIn PDF document text
    • http://poiskvod.ru/images/file/rixifusew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=antibiotik+amoksisilin+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://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_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 10640 bytes
SHA-256: 0ed8e98a509c9f7f4198af9a7bbed5e16af66305006944c3f91f826312ca3587
font_01_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 18076 bytes
SHA-256: 689e6459a9db1f4e095fc0258cd1fc27e987c730837c4b7f557c1d0dcbca5beb
font_02_sfnt_off00014364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1