Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4152bde9bdb1c1…

MALICIOUS

PDF

104.2 KB Created: 2021-08-01 22:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bcf9a38e4306302a2c4ee706cc767486 SHA-1: 0341446c0dc26efde7491f494c89a7b7232c3199 SHA-256: ca4152bde9bdb1c1d985210f379e024a21f01684d507e7833ab61677e2663e8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript, though not fully detailed here, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://alibabaoman.com/basefile/alibabaomancom/files/68783383692.pdf In PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/bunusumotisalimikilis.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/13004979354.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/wazerifefixi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/445bc5b87b2c8978a2b5f3695550ecfd/bevitoxape.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/zoxonedulisajobupew.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/00476adada15d56b510169a90063cf7c/vunapivatexotikazolidoxe.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zifomusat.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8dbd12d7f19f1524c8376cfd4f5d116a/67682433348.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffa089415d---3843907210.pdfIn PDF document text
    • https://baongochoa.com/upload/file/18966697182.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/4185s0m1k9ihmb1froh54p3eoa/jejurufebemovufipu.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/99330391045.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/14220949815.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5e418b414a082b521b61ac0beda839a6/94779595702.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/vevazas.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/34406814654.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/15becd8ad24554f5c17c66341ac40e89/lamobepajafemevitamines.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/54506729004.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c642a898a1---gazavegovetujibefo.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/030ep15ntp429oq1753iuidjcs/gegedarisatinajel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+write+appraisal+form+examplePDF 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_off00013186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13186 17952 bytes
SHA-256: 4ae689abf6da7c5f75332b465c0b5bdfcc28bae48e88f62e936936d74c06165a
font_01_sfnt_off000160a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A7 10596 bytes
SHA-256: fd6e63515a6d4531b50c5945d9f30bff36982c8a47156a66ffb0c7d573baf4b6
font_02_sfnt_off000178ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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