Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e87dd3c5543229…

MALICIOUS

PDF

72.7 KB Created: 2021-09-22 14:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 909d7f8da4dac9707ce5134e38912541 SHA-1: ffffe44039dd6825c2a0adc44f66278871149fad SHA-256: e8e87dd3c554322941bb325312f07d03490e88e4ff13888526f3de23e331735b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of 'utm_term' in one URL further supports the idea of a campaign to drive traffic for potentially malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=gta+v+android+apk+download+free+updated+full+version PDF link annotation
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/bewafovagule.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/83019940688.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/nizolupejataka.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/pobejazara.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/kimileguludavirix.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/26734374033.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/jebivuxafusijutorubi.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140591c33e94---texitofazo.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vibapowudivem.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/87238918373.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/509821793.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/nidugubetorogowuxipe.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/42403006956.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/wunozewafi.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/20388207187.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/77930315492.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/fumotubewiduzubasa.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/bawavujovakugidaxi.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/82778428274.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/11072149859.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346aa5e5109---23207055383.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/zujexa.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/19134537576.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/3395474540.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_off0000b9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B5 16280 bytes
SHA-256: ee9d3f0eb76b96099cd60b5dd699613ca27fef36849b75c45b250098819278f3
font_01_sfnt_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 10872 bytes
SHA-256: a6fc7331c3ddbd1a9d18e56fc0ab69364be0309ff3ce958210e83a154a72a7a2

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