Malicious PDF — malware analysis report

Static analysis result for SHA-256 4215a283d29f3cd6…

MALICIOUS

PDF

86.2 KB Created: 2021-07-16 15:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8f7db4930c612cfea20d73ac46ee49f9 SHA-1: 94dd76caaa4747989f7cb095ad8cef77f2a8b06f SHA-256: 4215a283d29f3cd66b6561f7a4bd0f70665fde325f18fa1ebb53e4aca3850b3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/an82tu97ps7cbai4bmd40v5hn6/wawedulobelataranaluf.pdf In PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/didodidebusobigik.pdfIn PDF document text
    • http://scro.ru/pic/file/dagizovurajikabuwut.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/11529604184.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/51150353900.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/6abac70f0f584c6a42ad7ee94b84ecd9/26391199148.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16092384606ca8---67320260332.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/32f8cab7c063c393a44e3273e1d38417/tofelajofat.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608396e362d91---17843972403.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078814d8064e---botewun.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/73864874950.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/vozike.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3ad12500---97399626826.pdfIn PDF document text
    • https://wasserentkalkung.at/ckfinder/userfiles/files/bukarewaji.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/3317055643.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/debevoxunofalajew.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/lakiwoter.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a886a5874---19597312446.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3d5ebd149fcaf54aaf57bc87581b3cc8/39775835905.pdfIn PDF document text
    • http://faradbox.pl/files/file/kutevera.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1017db26b9---70247859478.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9a9e19ba---pubomuzotitalilot.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/deguwedidomo.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57b4ca0ce---vowokipok.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/62695793130.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/23530283874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=advanced+perspective+drawingPDF 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_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 10656 bytes
SHA-256: 12ea8482063583ad1904fb7d40328f5baebee14aa6fff9f88888b5977de8d334
font_01_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 17268 bytes
SHA-256: 126d7ac3e9ececa387eabe67a56a5b52d79eb748015a364b194bd21bf3f5e7d1
font_02_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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