Malicious PDF — malware analysis report

Static analysis result for SHA-256 663254c55ae077e1…

MALICIOUS

PDF

102.6 KB Created: 2021-07-10 00:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 67a17bb142c5e4d1290f1857fcca3cd8 SHA-1: 5d59bcce6fad706b4e9a26b7d598c189d2ebdcba SHA-256: 663254c55ae077e1ef61f54f0c3a950376dbb6159a2131b8f64cd905b0aabb66
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 WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/02i9bnhle0psol68up8m29335b/bokokaribi.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/93871789935.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c0dfc978c---bozubawejepoxenororitoro.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4f0c8a4d---gajapog.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/kujalujobaro.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160761fa6df6be---gikuxa.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/faxepal.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f202f01d7---diwelipusivegida.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/dakuxonudame.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/xeleriferopiganinazowip.pdfIn PDF document text
    • http://fygl.net/uploads/file/251950265396.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/32746594991.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/4489283907.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/71774212219.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c734f251---dakibuxa.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/82643174080.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/16735554022.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ab1f9b559---19388030824.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/18448807380.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e284b26b0e1---27888459315.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce070d7f5d---6234471056.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/49306822745.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b892b1bcb21---13135048444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=justify+in+tagalogPDF 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_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000147b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B1 10364 bytes
SHA-256: eee428a3dfca700ace6e8774fa0ff0067b4307a32957e33889bdd18703c8c889
font_02_sfnt_off00015f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F48 17636 bytes
SHA-256: 51ff0a793085f84a9873282e5b1ed7032d8ac32970bca4a33c42d433c3d0f56f

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