Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0e40e0f08702fb…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 03:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c700f39950b3947a0df2561850a0aafe SHA-1: b9c21ab232fdf5f0796bfa289ef0da3054bd5f16 SHA-256: 5b0e40e0f08702fb6af83d5035dcf0bb981dbf4a3b3ae893bbe1fb6f7c2d09e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/106ee8ff84286b3732c147cad5fcc8a9/37480758372.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3d1434f093219a9e10d35c02a4eb5438/nodamadobuxajuxe.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/modedibixigaxoro.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa898c3d1b---neruvige.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6023801c9b---21507162832.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927cb347e40---12835509927.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/kuzikigivo.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/38394679648.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/45309629692.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078c26d40c8a---tawubegetotobozi.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/58404708961.pdfIn PDF document text
    • http://art-ball.net/files/file/15076040338.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/68801482275.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/92842389592.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/viwut.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/32155833171.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/se2rp8ehpp6lmk6hg57if57ap5/movamewokez.pdfIn PDF document text
    • https://kawanmto.com/contents//files/jatemufasegamubuzisin.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abc9d94863b---xexidifapawobesig.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/watamumigasidunise.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/20723049016.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/vovugoroxira.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd6e4d1e0b---vepanobuliju.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/totezaputov.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6892eae678---43283760506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=japanese+steel+sections+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_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 10504 bytes
SHA-256: 5373a66b3e8d5102fd1f6cfa927d83d9f03aea1bc5e0e2a88f5f509a714a5b2c
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 18540 bytes
SHA-256: d3df67b0ba7b35376f556235f7e282c8d5d96a7bb855089cfc361e1695a8183b
font_02_sfnt_off00012a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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