Malicious PDF — malware analysis report

Static analysis result for SHA-256 18987c36eade2989…

MALICIOUS

PDF

94.9 KB Created: 2021-06-27 06:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 856fdcb31e83312561020ac0090852ff SHA-1: b234e7c2f7508b3d76232fc5a8677760ccf04671 SHA-256: 18987c36eade29896206568418fad6fcea43b1b89714fcf80e8ac1fe9bd8e058
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with a spearphishing attachment used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://coretry.ru/uplcv?utm_term=red+ant+hills+in+yard PDF link annotation
    • https://autoroman-service.ro/imagini_ws/53382898897.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/11b7fa10e69f7bf3c174693eeeec4654/bulewupaxukixubeposama.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c196d63cf23bc3c816401b8bcdd57be7/58768124294.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/kizizofebumona.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/71560104871.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65cf40af16---37452180317.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4ce944979---38108729469.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce3a8be0eb---jatijaposajuginukax.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/76747024775.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6e1b7160b20a907b0d5b0363db8d0cd6/sobitalazepu.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/julunuxefome.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/75567853290.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf263290d16---zakujisogafagigezog.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98a38a24c2---rejabuwalaveb.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/76960104612.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/41c51aa468130860005e80a97a2e0c89/vepugawaxolupufos.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/37d39f24db101fb4ad64d44f87209756/lupemux.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789d57c14ce---ribofidewobobejupafixava.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/41237245245.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/67f66495cb6b58023c863b5d2b15bc6e/tibixuj.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ce9db73ade6229ba635c637ddf377d21/retadulosurojenukuwibudul.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/bc8778378ec6ecc916ed1b9c98d26b9a/guzupebafewava.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d50912028b---mirazobovanopirirozis.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/87764af0f92e033ed25e83c4ee2e35ac/luxosebe.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_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 10384 bytes
SHA-256: 9c82f145f41c6b8fe20cd327d7f7989863dace114f04a550a8ddd3f757ec1d04
font_01_sfnt_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 17260 bytes
SHA-256: 8cd10789baf7b1113a6d3ebc616ddc6eea6fab908a07bed97747dc429675f4c0
font_02_sfnt_off000156a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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