Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce58986703c49ba6…

MALICIOUS

PDF

89.1 KB Created: 2021-09-10 19:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98a91cb8d245de9ebbc384c257cbbf79 SHA-1: 1244a940ba8ab6c348f092d3378371d61f930b4f SHA-256: ce58986703c49ba6b0ada42de55591ba6ed751bf2a9b10b9b103f0caa8f27e06
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple compromised upload links suggests an attempt to host malicious files on seemingly legitimate but compromised web servers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hitecds.com/userfiles/file/6138009070.pdf In PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/makafajaluwawukapoz.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/samuvodasasigiluk.pdfIn PDF document text
    • https://proxus.nl/file/4432097034.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109010756541174.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/91604241669.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/butukojababelab.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/kibamudix.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3e181826---310875018.pdfIn PDF document text
    • http://enewind.com/pliki/file/60857678194.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56699580423.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/fizob.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1d4ac421---tatexudizura.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/tudadawakutemekura.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/88094947681.pdfIn PDF document text
    • https://gdaniec.com/upload/files/tegobudatusit.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/92651800768.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/503b0de90539a07e23ecc93ae8affa83/sulelapogugijunip.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902200413.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/42888155852.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/wametelajek.pdfIn PDF document text
    • https://asken.as/bilder/file/13353588536.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/53649581264.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/58263176715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=spanish+nouns+that+start+with+sPDF 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_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 19664 bytes
SHA-256: c07420b0718a627b2c43e5a1fc04457637a3c1080dd5520759f3e8be32c2f776
font_02_sfnt_off00013f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F46 10432 bytes
SHA-256: e63df9e76d88d22f8a544909e4662a830b58077b68bda1ece2f6e50d8026c3bb

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