Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6171e09c522fc6…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 21:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7ca82bd860c669b4eec7a86d09ca571 SHA-1: bbf4d045d37dc3b2a602befae4e1e87d996ec4da SHA-256: de6171e09c522fc6aea91050e1b61690b0b5a385ccdf17c110db4e812a3bf0e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://schmitz.cz/res/file/nomogal.pdf In PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff61e7cd5d---zawodumakudugixizutot.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/d3qaq1p76t5oiml08k96at94bc/motesowelitupesomagum.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/wixiramemamavoxewedewised.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc98e749fe---63429931282.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/12401981665.pdfIn PDF document text
    • http://cke.hk/userfiles/76731776228.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/misahpbjhf2victftb83omivbg/533351281.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/vbirn2b8ucnqqcpa1bjied2u55/8963748946.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d9f08ec1---359531636.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/55641745582.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/68e643bd134b5e8addbf116c4cce5aa7/dojowuxekagido.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/37670845548.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134892e261bd---76799653555.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1e48ce9a---poxeremetufoposo.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/xugagukixisu.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/21193769120.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/kisufowinumabaxuxebexig.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d75734603---1332629468.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210629000045895036ga1w1y.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e6d7b402c---kuvaxo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/77dkbd543t6m8j9t7lltbbkm34/85425942765.pdfIn PDF document text
    • http://ridendo.cz/files/file/87939714395.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fede3ed0f42---tuxapeduzajopagivuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sherwood+anderson+hands+pdfPDF 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_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 10520 bytes
SHA-256: 32ceed89631fd2ba37235fd3677177dbdd77845365bbe04cb33341f8003c1191
font_01_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12164 17664 bytes
SHA-256: 2dad6910d70c7c2f60117f0be4ec14ec58a2780b7fcb961949cfec63eddfc4c9

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