Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed76e90385fc7a3…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 05:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 40abee22aac9a37f695a05b87559064b SHA-1: 4d103e4a5224ba6ba4a4f870ac7212a3ded83818 SHA-256: 2ed76e90385fc7a3f027da55fca034309bdab603451b8b3071ee24b7c6d82225
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, indicating a likely phishing or malware distribution attempt. The presence of multiple external URIs and link farms on disposable hosting suggests an effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://dermalab.pl/userfiles/file/deliw.pdf In PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c61c558d38840f424de4b78f20c7d660/39602901244.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/51360194242.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/97613452991.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28178375c---nitixedug.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/tonanuragowawufegisazum.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6602d35983e0ab3c632f2832db76dea3/25722292801.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/66143894124.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a815187a13356fc58919215ddc903eb/72192097399.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/jdjjd5fhjoega5u4d3phe6uohb/87581813070.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/031a6074d3de18eed0a01a9570a9c42a/72131147304.pdfIn PDF document text
    • http://ubest.ru/images/file/bafejurixejapupeleviv.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/tolapasoraxonotokujogi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2dcf7b33a---95540288112.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/72819721160.pdfIn PDF document text
    • https://digireg.cz/upload/fulavi.pdfIn PDF document text
    • http://guowangcable.com/d/files/vukuse.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/2386480647.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160829102475c2---7343446306.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3ef9a778d---torig.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/lezazom.pdfIn PDF document text
    • http://bertolinacare.it/file/28545235181.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210616094735.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rumotozemibofijonufi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5cabc2b5---14379619894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kandha+sashti+kavasam+kannada+pdf+filePDF 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_off0000c309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC309 10692 bytes
SHA-256: 10b8837a441b27f11d6196f971aea79c36a7dce035f5ae53cc342d42d0ee65e7
font_01_sfnt_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 19960 bytes
SHA-256: afc6fae7af2e14af8dd147031aa2e35cc95b10b5fd31d19e9f0574f9a49088c5
font_02_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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