Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b36516ece9caa1…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 10:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6726cc78ad2a351a9404ac5690f7eb69 SHA-1: dc52e05049e7feb9aa15f4a29eb7095fdaf36029 SHA-256: 91b36516ece9caa1c3d8ec4f2b0630becb700f6b4e4d06ab589a9d4d9f2f3b29
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=omega+masticating+juicer+manual PDF link annotation
    • http://axwelindia.com/uploads/82661407658.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4447207ee392f5f4b49ee23c86fdba9b/60359483559.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/74524015579.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/putisenexetozipe.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/1d60cfde94543c01ce83dfd656ea375e/16071420627.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b881f187c31---laweguliponuxuvolomogamo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160f4716c3e93a---58832510776.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/42757390970.pdfIn PDF document text
    • http://onlinevay.com/upload/files/jerimuzi.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/723b6ae9f509caa4865cf9fd6898885f/laduwa.pdfIn PDF document text
    • https://le27.fr/docs/file/mizigole.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f529fa4ccc0---dopitininiwexajoga.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/89570800685.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/palufopisozulowud.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a7d4f595---26921790289.pdfIn PDF document text
    • http://spharma.ua/files/file/69889018063.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/16214364374.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/dedoziposigeme.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/9036499778.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/jabidenometotuzuti.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/tufixanexoxarofi.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_off0000bf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 10708 bytes
SHA-256: 54cdc950e03b176632ac4a6a24c23d5f6567fbd35ac7d07ac122fcc1c12cfabe
font_02_sfnt_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 17952 bytes
SHA-256: 9271caf127980c9f49d69685255a85e5b76a222010c9b00441dd058daff3d257

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