Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a663e388631b66a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 01:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54e27090a24d872955e4d10ace7d7c8e SHA-1: 10404a13afbe64051def7e61f97c6891d6784ab6 SHA-256: 8a663e388631b66a14afb5b9766864317aa78cb87448d2e674f0f588bfc7c6ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=np+array+of+ones PDF link annotation
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/2f11222adb1e6306df4a77b75f65aa23/27233923226.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/soxeboguwederagonebek.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/5cochgn0222pe07aebgr2il71s/92018786019.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/dazivo.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/37d1aa51628771331f9d8772f4d5cdf6/20044061178.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/85152929758.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f39be57507d879b6f341d08656d8a697/dimitosunijokajat.pdfIn PDF document text
    • http://abpaluso.com/upload/file/nevoxijujogovufedabivawuj.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/2332022937.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/76678348502.pdfIn PDF document text
    • https://ksuskalology.com/images/file/11844752034.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/74971175256.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cc1b038d5a9cceaa727d5cf1d6218ddc/tikokaro.pdfIn PDF document text
    • https://noventa.cz/media/files/file/wulaxuzumepobivel.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ed334a22f5c383611a90f622c08cadfb/35084746666.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/14810702634.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/kogedoxexosuzuxamili.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/vafigomawovapalewasese.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925e5a448c9---jovodimobemoramezekuvoxu.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c89410947---sesusosobuwopupezasowale.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/n826a5ik3ta32iplca4knuebl7/80065238727.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/sudutese.pdfIn PDF document text
    • 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_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 18060 bytes
SHA-256: 313906d991758e38e5915b1f5d8815eda6e364519671a9da7644a9da8550910f
font_01_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 10208 bytes
SHA-256: d43522933339749bd06060bfa4b76fefb40eb3632da95a4a05d0d69e0b62366d
font_02_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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