Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b8af80fdd2ab60…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 06:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f53907be4a0966140e7d05835c852a74 SHA-1: a61482985512b856f0a9356f26d5a70c33991036 SHA-256: b1b8af80fdd2ab6087b33304e673181a3abe53cdfe4366a9cc4751b3708bab55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ketchas.ru/uplcv?utm_term=database+management+system+gate+questions+and+answers+pdf PDF link annotation
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/20382091344.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/55837224814.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960c13391---28184005399.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/lunubi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a23ad7a74e6---leziditow.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/gororipuzamipobanepamusup.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/58431648963.pdfIn PDF document text
    • https://kopari.hu/files/file/95639669529.pdfIn PDF document text
    • http://teplospectr.ru/images/files/wizokakuna.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ueradlkk92qb3ve138c0hmd2r0/jopemepuj.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2d83764ae9438ee46db77c813cf0ce0e/xolepofelatexedenezo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04b4758486---3596533842.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/binolifezepawilasa.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/salitisepute.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/nivuzedim.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/35b02ed119015341d54fd5221ffbbb9b/11065707814.pdfIn PDF document text
    • https://emprenderem.cl/files/67231218167.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/20808848978.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/rakosixowugutot.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607384f2b3028---79072228345.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/acsd0u9ad4g2ftrgdcp58utusg/juviwub.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91726eb4c---99936551655.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/51425363153.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/jipezidulixagukugolapupen.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/2513166467.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/tetolezofe.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_off0000c8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F4 18536 bytes
SHA-256: 64232de3e604fdc116ccc342bf766c2b722acc05eb8499ff85401a86577da67e
font_01_sfnt_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 11380 bytes
SHA-256: 63515c6f281a0e4cef15c7e9626e7031632848eb64190ecc15b2e4b46c9e7a75

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