Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4491a9230428a70…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 00:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35ba06c938738cf3c1df48437cbbb85f SHA-1: ed59be4a62dda5b599a03bcf05b19bde9baaca6d SHA-256: f4491a9230428a70c95569f90e5ebcef28429ccb7002c5f2db813b688f273744
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics further supports the attack pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://raegcafe.com/uploads/files/tesigefafigubasevoropavof.pdf In PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/vajotuxizivujazoj.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/pufetititikefi.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/82107660618.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/22ff954959a11cc9364798bb768a38f8/44632675076.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/82117755487.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/50364593190.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/49844362562.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/fotapivor.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/mebilufo.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/22262748994.pdfIn PDF document text
    • https://telenovella-bg.com/files/72505225252.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/jarutuludiwuxuze.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba1802bcc6---54335083128.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/dagixed.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/sogoxofododugodexezuvumex.pdfIn PDF document text
    • http://juentai.com/userfiles/files/29669883245.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/xitelexufu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148273462b13---vedidapibe.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109210231354189.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/94889651824.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/76694642830.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riwinifuponenexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pubg+apk+obb+data+downloadPDF 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_off0000b171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB171 10492 bytes
SHA-256: 2e61729cee0a53f780bbc85ca6a25ca79fae63ab530b9b26f523955da2ba333c
font_01_sfnt_off0000c903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC903 18200 bytes
SHA-256: 87a71485bca26fbb2b98f0408af76d6f5820e9014a2c133b36f8b50071b0f68a
font_02_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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