Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8be26815f1b288b…

MALICIOUS

PDF

89.6 KB Created: 2021-09-16 12:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d076b90bf8b4b799befc25ffe22919d0 SHA-1: 7295048be5696e448f126cdbf606613fc06bea5e SHA-256: f8be26815f1b288b4ff3cb027e7316c1224ab8c5b8444cb60f5d4842dc0f6b6d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these are common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://techcessgroups.com/userfiles/file/nejubisatesan.pdf In PDF document text
    • https://polaria.cz/images/file/95793656647.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/85133508697.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/fiwevixis.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/52383661333.pdfIn PDF document text
    • http://soupworld.de/upload/file/45676957743.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/69181204261.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/kuvigijusigubafujoxoxivut.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/38492139420.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130347bdef76---gilesabixuragomotew.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/pedawujuxovikok.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614119d946302---kamotuz.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/4770620048.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/88657215750.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/kibisef.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/45493817437.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/kidojiwixexonemedu.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210902111636_mnuzkd.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/wilamodoj.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/92048814562.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a63e3553bad278a2e44a7b38f43f796a/56074024071.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/42854958305.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/98846972667.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/64317500883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=voicefx+voice+changerPDF 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_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 10440 bytes
SHA-256: a56ad802f9f327b268610ad2a6d2ffde5a101648944118970323ba3c6c1e34aa
font_02_sfnt_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 18896 bytes
SHA-256: dbc8aa07e54fb82175397c36baf929c3e2c60148e0978d66cf06a4836f71be5e
font_03_sfnt_off00013f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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