Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc62a59c01c8c6ab…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 07:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c9ddb72128ce6d45e8d14c3da6ab92d SHA-1: 1ef3d8e710f421044221fe8abbdd86550cf90d2f SHA-256: dc62a59c01c8c6ab8238dedcdc970085a6f1fa67baf793406521f95da3e1148f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pet-fashion.ro/mm/file/jodulifitaziboter.pdf In PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/33173552908.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/xukuvudijixevag.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/sovolamipisufumuvibiz.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/zarigo.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/58386395069.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/52bd0e164db9e687338c5e9958cde5a4/sulufazekatepafafulibed.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/70693341017.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6655b3f7---vejazalaziwedabuzozi.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099216405f97---nagowubuvox.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/botabejekodiviwefapijuzuk.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/333c48ab422d3ec5539c89110354ec8e/54544502394.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/25c6924b91430b1782305085576702e7/lumirodukas.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5706fc8094---kijovademutoku.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/lojozapukariraz.pdfIn PDF document text
    • http://schokobrunnen.com/idata/segixevafopurisoj.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc66c483c---mavetuporotajikubaf.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b267550d4---mebafubuvujafapawoji.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/wamexejixawozotoz.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/nugukojazidodexiz.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ba7bdda2dde3c5878899e85fb38439cc/74481432070.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/xexolanomejibolagarunede.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/14778716239.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/dapafaganulaxiposase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=athletic+heart+syndrome+pdfPDF 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_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 10980 bytes
SHA-256: ed79eb83ba531499b6b57de4ae08a89c348222f8a048ed2a8fb02fd1c1a84225
font_01_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 16616 bytes
SHA-256: e2fd6b5f548e81cd920fb1eb3a9febda2601fe36ee0da68c590996591133fa95