Malicious PDF — malware analysis report

Static analysis result for SHA-256 955ca95a87b9062a…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 06:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 25aade08e9eb5df7f9e1590f49642a49 SHA-1: 178697a3459b4a6df9cbf9df2c39bfd053dee48f SHA-256: 955ca95a87b9062a32dc752b5705beea8c786e19323ec3964a81c599026bdc65
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous links to potentially compromised WordPress upload directories, suggesting it may be part of a larger phishing infrastructure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack aimed at tricking users into initiating contact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/89c941f49c56f45f8272346f4e053c38/45050106743.pdf In PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/18882397926.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7he3rh73lqas65fn0sgsbtkbfr/56321717956.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d30b786fea2ef0fa1648bcec8da25fe0/xikepumafeki.pdfIn PDF document text
    • http://sun-eko.eu/files/file/silijubomu.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/71965775005.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a23427bab---tagaxekibakanexuxajop.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/zuxepomovarirej.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/sodenivi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/672838e121d526f492a394c039ccf57b/70267670369.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1d1e206733d09806d7b0d942bc7ef5fe/bojilelana.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kelugogubil.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/15c6c46652faa2ee07165b431f46d1e0/wafarebuvirizuxodovowudep.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/4v3sm2qvvig2btu1ulgbuf4gg3/74524166337.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/tujelopozelojasinegitek.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/6685295910.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160980d4f1cdce---koweridirida.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c3ccde17f---verujinopatav.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106061804.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609f71ba9fed0---tisuniwam.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6c24d8b1a4dc5612112e1f7d1b9f52ab/nanezezokabesirijof.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/450b3a3e82988db64e2ed4b75c4b6bc4/momowitujaxevilemetetavo.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ac5ba0d8c0d9ed52799b6921a97a6838/vixivutixapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=telephone+reporting+for+eiPDF 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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 10272 bytes
SHA-256: 3ebcda31873903524d938ee37c65ccc62156d0fb7f11cec3669f2a7de63826b4
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11710 17016 bytes
SHA-256: 036e4cbfc591bc7fa8887931f0580496efe617c898a113ac2b7a1f1463a067f6

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