Malicious PDF — malware analysis report

Static analysis result for SHA-256 e396dd4ff0aee471…

MALICIOUS

PDF

88.7 KB Created: 2021-07-30 18:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cbc885d62c61e4fce8cb97f644924fd SHA-1: 1e4ca3718578ed960305c013e13cd83fb4a6da36 SHA-256: e396dd4ff0aee471caf1118ff0e2294e0b91b168c4673057f88bdf0d2f246260
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are characteristic of a campaign to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/86cc0d1704b0f4f5cac3c7414e02a040/9708031381.pdf
    • http://medipharmacompany.com/userfiles/files/48182913887.pdf
    • http://bukharageorgia.com/sites/default/files/file/61037353444.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b6ofd2cp4snom43ohp4b3kp9a5/pinuwizosilusokakuzaru.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/16cafeb72264a4712ccf42a5699e70a0/56916964602.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1020f1f5---naxusujotojizuwutakefe.pdf
    • http://raczcsalad.hu/files/65463820866.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8bd7d0d6---mewababaguxubiratesezer.pdf
    • http://jaht.com/userfiles/file/beridubudurez.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f31f637550d---86409852056.pdf
    • http://sumisaedu.com/FileData/ckfinder/files/20210726_90811024E4424565.pdf
    • http://aal.tw/uploads/htmlupload/files/53740704621.pdf
    • http://rghsalumni.com/clients/82979/File/55369137417.pdf
    • http://vorne-sitzen.eu/pcms/content/file/rajanujujebidi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d11fcc53b---68049349837.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/musefakog.pdf
    • http://splogservice.ru/content/file/satadagojofotosomixizotux.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c79800c53---76113225727.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/rijop.pdf
    • https://appvid.eus/userfiles/files/98063970425.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7c5c82609---28477213423.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f4625263e9ff1becd304ca4e22e52028/vazeniledinowo.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d935d968---visowomoxubedovukor.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b8eded0fdbe4ee2cbaf288693896bda3/63425536824.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/prs3ksp0krqmf3drnm343rub2c/24435947280.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=eu+to+uk+size+guide+clothes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f472.bin
59ab557abe0ed2d9119da6059f13b188324dc797b5a34ed37ddb4d9ea30a560f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 10520 bytes
font_01_sfnt_off00010c5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 16792 bytes
font_02_sfnt_off00012470.bin
5784278b9f3677f6a8948359980c9bcde0fc9d9e8c7ef81dbe0d7967df6a364c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 17708 bytes