Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df7573d0e82785a…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 03:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 435ebefb6440d5c0104d348daa220102 SHA-1: 735fb0b7ace3803cb2b9a1deba40658e7acbc0e0 SHA-256: 5df7573d0e82785ac0a087015491e04ea2c4b226ee43fd14366f18aa136eab1a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains numerous links pointing to potentially compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The document's structure, with minimal text and a focus on clickable links, aligns with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c25c835c30---gazuli.pdf In PDF document text
    • http://uniquecharacters.com/upload/files/sozobapugikulagututo.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/narenenejomep.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/64222328399.pdfIn PDF document text
    • http://ssp.by/var/upload/fezimuroxuzetim.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4985d7eb---76800657552.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/87955270212.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/teligufemalikofebapuva.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b55f6849b---31917204383.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/11639510993.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/majikofonopelodezadupu.pdfIn PDF document text
    • https://cinemaparadiso.site/uploads/files/11171807129.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/46296226207.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/xemobirorazaxatidikuw.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/wovimamulexo.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109240727436123.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7ptbatri2airt7bf9h44bnapii/18923084878.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/falapejujelijisemapinonu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/76cc01d878631399a0a5bd939afad6ba/barab.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/30808053488.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/wemusigamujanitegiv.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/dimapobaxozejino.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/jokapul.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/sevasefuda.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l3lfiqlfu70br4s16ud0lvuvn0/25415674153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=league+of+legends+mobile+apk+free+downloadPDF 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_off0000b40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 11120 bytes
SHA-256: 2f357c08c83cdb28d15e3a6f0f3eef32242f349d2696abe92b335a79e8d5512f
font_02_sfnt_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 14232 bytes
SHA-256: 08a21676271c3021389014bf5e963aa0b7e5e4626e323ce8f19e1eb0e76e6481