Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed852ee542b0b78…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 04:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 706d32da79da8f7217bb3ead06cf5316 SHA-1: cf3f5e0ad87c17f8f72ace58a59726752b6830be SHA-256: eed852ee542b0b78c84490c561236314f8c372da21e785f05c14f5e15fa64bcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations. These links are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd9bd75c5---badenopoxi.pdf In PDF document text
    • http://edins.net/userData/ebizro_board/file/tugupakanojav.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e52563817a9---80791049191.pdfIn PDF document text
    • https://phuquiland.com/upload/files/48906102531.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ss25ol04l7fno6j9dvhrvnr8ts/kododitafatukomi.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/80969071206.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/48670584314.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/wekubapokamigodobi.pdfIn PDF document text
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/83835870102.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/vsrm2pi2t5nretm26hm92cr1m7/pudolobuted.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080eba5b4ddf---60277933518.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/43314784746.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/fifelaxagefatuvamowozi.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/lijosegolupu.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87885025008.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ccf15621---12509454590.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/fijetoledin.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160be4295dcd6d---lowabebolatufabebatamapig.pdfIn PDF document text
    • http://poetryforthespirit.com/clients/872464/File/pisogenopiramag.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd393a129e0---26653012736.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/31792268542.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744fea07dbf---18720674761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cooking+beef+cubesPDF 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_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 18444 bytes
SHA-256: ae06636c9f5c371dbc9bf550799a0c903a075f7b11f106978c8b8df490db5225
font_01_sfnt_off00011f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 10468 bytes
SHA-256: d98b49bab7ec6d1cee5e88fed6b308c3fa95d99a054be0c7cf540a7582242b3f
font_02_sfnt_off0001377e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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