Malicious PDF — malware analysis report

Static analysis result for SHA-256 021853f4806ea5c6…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 02:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9208774d8783409af83cb6f791267ea0 SHA-1: e932c4562e89cf0db8d28e49a407361d13518ec1 SHA-256: 021853f4806ea5c62590e220c4dee362b9c924d14b120ed90b33e8306ad8b7b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure as a link farm, coupled with the presence of external URIs, supports the classification as a potential phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=free+install+games+for+android PDF link annotation
    • https://aldapa.eus/files/galeria/files/77279243436.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/6129142588.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/27868718969.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/rotupejalenisegisoxabaxed.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/mekarilanejenovipu.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210908_14E2DE8968E83FFF.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/benazafenumaza.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/sexopugawikegebas.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/50c6e3119617760a528db7bda3df3661/nigonunaxakamegakisuragi.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/49414598883.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zobolot.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/sexagivefisa.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/56265857236.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1fa13106ff9488eb1b0f5c31ae789219/93854495046.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/74149377497.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ec086ac12262df0579c071099a68df0e/118681629.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/79037301641.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/vesizujisatujagope.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/xojabukexibepu.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47959067572.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613991e233531---gadudapafiz.pdfIn PDF document text
    • https://alev.az/userfiles/file/11016341663.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/53758710850.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/33762627589.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/bedidujilefuwevizoz.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_off0000bdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB1 17136 bytes
SHA-256: 8c47e064e81fa029a1eff3e191c917af1e3716668a792b3b6745b3ab11bcade9
font_01_sfnt_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 10676 bytes
SHA-256: 56fb65aef6fd6124dd9a7f47e2edab7e727c76f92192f1383f501341d0fb90b6

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