Malicious PDF — malware analysis report

Static analysis result for SHA-256 4feb90f3b5498a5f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 07:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5d9424474701baf8d17b86e3821fefe SHA-1: d3ae5196fe2f43001c492ee1d4d5dd58dcd58031 SHA-256: 4feb90f3b5498a5ffd053d9f2526010c33a65b7deb6d4ecca6f7f5fa578924bd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=hc+verma+quantum+mechanics+book+pdf PDF link annotation
    • http://hondatayho.vn/images/ckeditor/files/lobunuzoreladivelog.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gizisasipal.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/58822285279.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/7838807143.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6a89a2b2---94096765207.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16139498c6cefa---zigetukawuribijopibazo.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/xituzizapunudive.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/tapeganol.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/68639652332.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/jakudabowidaxikoraf.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/3905532575.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3cd25bd4f22ad28f2947c85a9484d16e/4247478.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/werebepuwema.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8d31ec32---tabijepolufe.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/ritazomofidolixibur.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/58667268444.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dddb685365---43511147803.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/67746100015.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/finujegibakesubuzomawiwa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee9360482---tamizobikimuguvonukini.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/76791656968.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/90031022620.pdfIn PDF document text
    • http://harlit.com/upfiles/file/12905433635In 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_off0000bcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD1 11376 bytes
SHA-256: 54d4fc6337d0a833b8cd6c7fb3f9f5ba2b125fd34cd0e1390e506d4bdf013022
font_01_sfnt_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 18048 bytes
SHA-256: 69503ca50377e1ad7a9c1bc854bb14e798763d75e26652b85279319fc3e433d2

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