Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae4dd3085bf17a2…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 10:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f07c5806c31f179d9c1318ad76b13ef SHA-1: 9dfd32afdf53d7605c662266049657f00e0bb385 SHA-256: 9ae4dd3085bf17a25e5246c5b41a0be7b46224971deaf434d538ae4014fda069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=types+of+manual+steel+bar+cutter PDF link annotation
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/09d3c68bcc20b1e0bea6541c7edc2250/78739677968.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/98081126076.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/fovet.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/jefujetijoxof.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7a9aa1d860e7be8a9bfe0bcfebe18fe/lurexob.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/pizomagaboforev.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/acbd72e7b7ff058182015567e0b4c0d7/gojojabivesipobegubara.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c260a0ac2---tonefinunapaxedujeregexad.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebef5b3db---zutajiveg.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/folaxunozol.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/15433324191.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/34234819871.pdfIn PDF document text
    • http://dhf-china.com/d/files/7192260253.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/damake.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/72452102860.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b6e768d646cd742577247c929c8f59af/gekivepeko.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a4527ae3---kopirixojasutoromafovam.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917cd4687a7---41963057888.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/79830848470.pdfIn PDF document text
    • http://edallyshop.com/upload/files/93366154848.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d52efab7255---doriwozi.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/niwowedimovuzagasavagajig.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/48978013401.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/05ef6p9svbmafuqmkcj1fdsb5b/13594821669.pdfIn PDF document text
    • 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_off0000bc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9F 15592 bytes
SHA-256: 11f2b139288f488dcc36385c70c55f9e945f784c02d74df21274d647b5a8ccda
font_01_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 10868 bytes
SHA-256: c64bc40231da3dd497ce144e66edec1d9bfafc143914e73ec8ca82418c387de1
font_02_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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