Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc993ff2d8581d72…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 07:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a34f2b6850c1223164404cbc975110d3 SHA-1: 22f3965d5bbf323c4f278caf865b097901474345 SHA-256: dc993ff2d8581d72b5624cb1bc5ad0f5cd42b5c1227f688b028befd4378aa1f4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress installations, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs and compromised CMS upload links indicates a deliberate effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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=dental+caries+are PDF link annotation
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b24c78c4a6---rimubolig.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/aa5d232042e71fe2f7f6dfa4ec50f298/bimomuxitovotuzilewaxi.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/kfnm64640rda4l1vsdhmq3h213/pukiponoj.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/27734441613.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/b340331935dde3cd4e8efe6fbae469f7/raxulinuxenarunopowabato.pdfIn PDF document text
    • http://jngf.cn/files/file/16267811554.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/17468172122.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/45900311818.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/64947668006.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/97232227818.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610820f3ebcf4---67227482527.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/farogusoguforapoguloj.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/98046888443.pdfIn PDF document text
    • http://farmina.ru/uploads/files/tubovowuzediraxekefenobe.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/dezadefupigutalatovogok.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b2c6aeae34e56fb5607bd465892c01c1/vefebowupekasosuzape.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/xiwewajot.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac812798e17---50031818256.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/14268727081.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704d983e0c9---13331273052.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/67975258488.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/27327387610.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/78800261575.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160795d25cab8a---83410913313.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/zuvelalipubo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/215e632b0660571df95058d42c765340/nedeluwenakomaforasoral.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_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 10104 bytes
SHA-256: 596a303e3b39d3939a6bc39e5636d5f8660d17c0f9309e7ca581556addfb753f
font_01_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 19996 bytes
SHA-256: 7bb0870efce6749fb162c74ba4d63f4c2d1cda2ee5823283f1b88736d2c392bc
font_02_sfnt_off00012b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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