Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dbcf134b02674f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 04:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e7006c9b0874cb36b3527e0839733d6 SHA-1: 54455f11f68eab8d9bd544e2e51301eb39cee78c SHA-256: 91dbcf134b02674fd7f536b05c478d9b73bd5319465e7f8388037b206f63e462
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous external URLs that likely lead to malicious content or phishing sites. The presence of multiple compromised CMS upload links and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=mathematical+methods+in+science+polya+pdf PDF link annotation
    • https://cgeminfos.ma/upload/file/98905117612.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/98220868123.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zetotifapometibenudefo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca2e00b639---12433100907.pdfIn PDF document text
    • https://comfort8889.com/upload/files/2808320740.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/givakodusawumabefupajo.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7ee2084953e4ad5d20393cec1be7766e/58183127950.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/396776517.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c7f26dae---kivemusixufojatuvegolokix.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/wuleriwov.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210719_5D8D435EB91F0494.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/91753552373.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/12964598014e28d411b445690cbac5ac/lumomed.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cc1b038d5a9cceaa727d5cf1d6218ddc/tikokaro.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/91236693903.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/326b0f645b58a670591a2fd7670be8b6/suvoleputalux.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/34978456143.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2db24a88de---xemigadejaj.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/95e8b7b21aea392146f13bd8f25593ba/kinogekigumitup.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/fejirobirosasidotix.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5955ddc9d---vegilazijedogenilepid.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/wafim.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7d78426fc55e39ecd90ed49ba400211c/kesabovuvikuvapoku.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/38154617930.pdfIn PDF document text
    • http://npas.ru/pic/file/39532665876.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/68133526923.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_off0000d39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 18704 bytes
SHA-256: b4af069bb2c40dfe3f9c853e8f89d677bdaa24894495c18c930b0c9fe94f790c
font_02_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 10892 bytes
SHA-256: d672a73e0cbe9aca3f4e40ac9e111e5b75c0d272c46527018e383d1c7f08a3a1

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