Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4925dd4aaca538…

MALICIOUS

PDF

88.8 KB Created: 2021-07-08 06:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0f652b80d26af9f2cf4d417c923c9078 SHA-1: 0e4cc2237f2051bf1ab045b9610fdaa5bde2d860 SHA-256: 5a4925dd4aaca538df6d63e3282cba3edf962cd710d24fcdbfadc990e60b4928
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier assigned a high probability of maliciousness. The primary attack pattern involves tricking users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9736588bb3bdec5b7559636704c82875/tajasukinejawik.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/88839559660d90566524d6.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1817ccb07---zedojowinevagupoxegafap.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/2577079122.pdfIn PDF document text
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/wozegume.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/zuvezezu.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/89346534298.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/17654407299.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab85d433424---topaxotomikiraw.pdfIn PDF document text
    • http://stattus.com/assets/file/90478946805.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/botazaxitazi.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/59401350373.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/0fd6a2c6a9320e707dc176b38cd30bc1/26843539715.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be475f35837---sobeduxiranaxudimusog.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b3d07046---wugogujiwerepevirunirizu.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/23385029297.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/47215457998.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608445097d51b---lijawexamonupawep.pdfIn PDF document text
    • http://mitra.su/uploads/ckeditor/files/gisokejimametaf.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/06e3fa15bf5ff1f27eb7f2064f6a8198/daletamigafakepez.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b342edb5---33566997641.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/10466193496.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/93570706789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=110.4+kg+to+lbsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 16960 bytes
SHA-256: 94823fd6b7b96f17272467f899e781d1d4164f1c5286d807b0f53da81beed257
font_02_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 10144 bytes
SHA-256: 14e1eb0ab4de7e5bb416c7bff0cce6535c902bb6d5206630abed99acfa075f82
font_03_sfnt_off00014039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14039 16192 bytes
SHA-256: f7b9253987216832ec511a3c7ffdd777d8ae21bfd21e5a9c2e014f7e310ea55e

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