Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0be3fd5df0a7da5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 03:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 459f1605c9b8f49abd61de5f896ed9c3 SHA-1: c5d03f3c6d9dfbc1983adbbea643ecd97bd0fda9 SHA-256: a0be3fd5df0a7da5a498927645fb8941282e5149a5fbbefeba7b3fa7d6af0c47
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded URLs indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b7d974609f23b4587559e94ff604fc61/37633356210.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/59465330303.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/acbb989a6f0927674b388ae38d73a197/xubizemabosabojumaxoxo.pdfIn PDF document text
    • http://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/33665195152.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/konuri.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/duxikixe.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/51662601729.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/41126965816.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/nuxakisejo.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/23213548037.pdfIn PDF document text
    • http://congtyvima.com/images/Download/27052926272.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/9005854933.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/gozorimovikirawu.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/5767576088.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078527e0d60d---tujozumujevapagemuboxafij.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c1c0e63d---62367449312.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160deb673ac670---12458446684.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/23950153979.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/gejilise.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/16212326382.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb590135b50---37801487787.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/23686285546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=describe+the+structural+organization+shared+by+cilia+and+flagellaPDF 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_off0000d06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06F 11168 bytes
SHA-256: d7bef01eb13d95783d9bc05529fceb6a33d3edb1f4342dd4622ba5ebdbef3c58
font_01_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 16260 bytes
SHA-256: 604b77cae60f0eba23bd2541da0d285208e60a7bb1ad2b0bfecfb47302aee3cd

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