Malicious PDF — malware analysis report

Static analysis result for SHA-256 f820ce1f2ff52a93…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 21:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 861b03f6c94f13c68b6c7c0be6766215 SHA-1: 5b857a45c0d54afedf45647c47bfed9fe0142a94 SHA-256: f820ce1f2ff52a9327f5bd334c7f05b5a18fda0e75aac52a392f2b0152180452
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vector. Several URLs point to compromised CMS uploads and disposable hosting, indicating a malicious intent to lure users to potentially harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://myphambambi.com/webroot/img/files/xipewir.pdf In PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/faf23bdab386d0734a2a7eca9ffba4d1/zibilewipejudiz.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/95020263525.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608764d3b85fa---33520769473.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/wuxanozuruzuxenem.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca85bfe1c---sololebota.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/wodilububanenewagufeter.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5bccaf644---fipuzaminikux.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/s54g3fkaj62kr30rf6a096mluj/63052277439.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609969f88db32---70281715373.pdfIn PDF document text
    • http://pronobile.de/catalog/file/votedegosanonozevizejake.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/83665607092.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0503bed58---lujigexinonojefo.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/885okl2javs3r7c2sisdv1nm11/foros.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/3719191698.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/87736553223.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/xejevulivasafipurusav.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/25426206583.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/72775058836.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/wirezab.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/22481355869.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/akl6bmbjpe9qd8nbhf79st54er/zugebabibami.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/67122164903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=calculating+atomic+mass+unit+worksheetPDF 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_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 18744 bytes
SHA-256: 44d254afed3e12539011a3d7ec2ff1e5b84ff934211c9b374ccaf10d372782ab
font_01_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 10984 bytes
SHA-256: eab71ffd4595737238b9564b01e1bba611c3310efe2430053aa7f78b1e8581e8
font_02_sfnt_off00012d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1