Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb0549af0028efb…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 01:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b575a482c7b4833fe3d73dccc887a47 SHA-1: a4b00ba2032bbcbda75a6f69b0fd5dab34be26e5 SHA-256: fbb0549af0028efb27799a0549371a43892984923dfb35610f90445f137b145f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates potential for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=understanding+earth+7th+edition+pdf PDF link annotation
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2a2e1ad62644426ed90abdcc4b679f27/bifemarigukalizeved.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/zojijimirevimurebetuvuz.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/roxekokapikuwotegawewomed.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/13661020575.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/42023632812.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/bupudaluxofowaveta.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/zidujoverojisesama.pdfIn PDF document text
    • http://ellev.fr/upload/files/laroledibekigofumujunabo.pdfIn PDF document text
    • http://imi.vc/upload/files/ximovudewijumovafukenipu.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/54232476745.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2ad9668cb---lejepidefupivajoxaga.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/26583657840.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/jewavakurab.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/39009645227.pdfIn PDF document text
    • https://go2germany.ru/files/file/zelufodedimogonu.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/10512918412.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/71501149267.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/41443833488.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/14480686886.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/kixofitixejefowowiruweva.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/28525808212.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/suxokojilesafum.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210913055957.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/04d84da34e596856933c94b01a8eeac9/dosolusupexodevak.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/18959247223.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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 18412 bytes
SHA-256: 49edff8a96e3c9bb4e20e0917d80da245d1b726683f3f939fc670e031897f4da
font_02_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 10788 bytes
SHA-256: 2e82231a0c55548b80f91bfb2b9351166fff544e2047ce5a6cdd27c1bd014ad2

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