Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5158cef4c752d7b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 10:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67108ef2cfbfaa15610bb83051eec5c5 SHA-1: 59f5bb324bf1dce01b10e4d8cb5b321d254b19c1 SHA-256: d5158cef4c752d7b58aaec55e30920eedd96add9ff4571f521769ba665428cc9
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs pointing to compromised or disposable domains, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution attempt. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://briztravel.com/upload/files/wojolaxesorefitixaza.pdf In PDF document text
    • http://studioarclab.eu/userfiles/files/dikunumelupelebo.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/tegigelofekipuridarenu.pdfIn PDF document text
    • https://digireg.cn/upload/51604356015.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/85308658216.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/gekuxobo.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/zaxukudew.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/2010575045.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/44686769818.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/xebubevolipababinirebiron.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/41653189854.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/18551257101.pdfIn PDF document text
    • https://diphong.com/uploads/tonojakizuvewodikeva.pdfIn PDF document text
    • https://ip-pharma.net/data/files/pazofilixotamivunikol.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/37517542932.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613084e40dfeb---kelonujurimenuw.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/94021352618.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/19072701354.pdfIn PDF document text
    • https://zagi.hr/files/75591896658.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/sebaverinerifazatige.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/96769236004.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/92669902519.pdfIn PDF document text
    • http://canvangdientu.com/images/file/ronifiguresa.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/nereruxeli.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442f48896b7---semufowupivel.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6e00ec87---wejamawetasozadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dove+trovare+aggiornamenti+androidPDF 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_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 10444 bytes
SHA-256: a169267699386e39405c1014ec94bd4be979ab8c740dc4201c098601ad1f56e5
font_02_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 17080 bytes
SHA-256: 55e534f2881f1ec008e684614b55fea8fb09132ee906f88554dd2cadf5aa2b5b

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