Malicious PDF — malware analysis report

Static analysis result for SHA-256 9293898941aafce9…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 07:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93b53206ee785740624e40b962100b09 SHA-1: 95a649b898ac1150d0aa82df380cbe313cfcc506 SHA-256: 9293898941aafce9d7634b046f568cf7d45cb10fa90e730776f2a9f4db292404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links to potentially malicious PDF files suggests an attempt to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d40b69d11f19492d1b4b09e0fafd2a22/vumemidowumod.pdf In PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/3220647680.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5dd0700ad72ab290f8fb531a70ef9ee0/11830576320.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143779db55ec---bomiloxanovibenixir.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/42081533144.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/74300961784.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210912063425.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba7315b1f---zugixafapebo.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/febewusisupewe.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c467b36e9e---12909808403.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/basidewokalafawodusow.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/51829267232.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614793bd52b55---disujuji.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d47918053e5defff9d77b2137633fbef/lunerolaxetuputonito.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16145bb6b0d173---24151960267.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/dolinexaguwabenovawawi.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/78428103330.pdfIn PDF document text
    • https://ags-car.com/upload/files/lodufupidilapufubi.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/pifirovekemi.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/79713985625.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/faea33e31ad3fd1920562dd07ab4e39c/damisilesomixepirizulur.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/dovor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ps3+emulator+android+gamesPDF 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_off0000d4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E5 10864 bytes
SHA-256: 947ea925f4b2ffa4090e35b3993b5ee1de7f7cdcb39be74645cdf727fc8f91f1
font_01_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 16808 bytes
SHA-256: 5617aed3cb2b0f34aa490611473563a9d01fa5994f1bcabfb99908494b751140
font_02_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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