Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ad1c4d24be9e0b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 12:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8565af2f134370bfffb051599c27b61c SHA-1: 248b1f8c59394b620a0009a975f53cbede10ff9a SHA-256: f4ad1c4d24be9e0b117ce96674aa6282089d928e24d0a8c030339da5b6dae215
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ec9128be---levatinivexenudapu.pdf In PDF document text
    • http://dooroc.com/tk/upload/file/71754538431.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109021316454776.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/78164964646.pdfIn PDF document text
    • https://maymac.info/userfiles/file/wuwuruzibedegug.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/begenalusifixiliraba.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/gikipipev.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/fozebalasijolemalad.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/sakotibofonazebuku.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/81230610464.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16148512de60c5---zawogesidutuxivi.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/93419987142.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/35351118577.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/86059706020.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/13777397743.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/6111064427.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/narolotepajusuzuko.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/wopin.pdfIn PDF document text
    • http://novichiha.ru/pic/file/mefekawikuduvazekane.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a6d8ff57ca3d77d21be30f7172268b79/40055381487.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/20986757093.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/kolunuded.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+add+screen+record+on+androidPDF 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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 10396 bytes
SHA-256: c5606d0984a27657a83f999fbe470c922e4ddf2513f81a58b763486909fbe318
font_02_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 17900 bytes
SHA-256: e447c522c74f3059dccac9ee5e8f62429efe5468bc76c4fdf106537a3174abea