Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6889f5fd1f3c05…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 19:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62e43d4ab3fd83dc06af493fce95e5f4 SHA-1: 7b53495332d321cb1e9a6e23352ce9d05a2ec648 SHA-256: df6889f5fd1f3c05deed45d86df8cef660c241bb3d3bb096c57e5645c7c74c85
164 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/f716989b05d310f4892831b78382224c/69125290262.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0dp1eglihj3a9hoek32gl41l3r/nisogubusotima.pdfIn PDF document text
    • https://actor-conseil.com/files/file/sabelebugoxuj.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/926192a9f96f26d6cf6aade3fe190d68/51054911821.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/jixavezasefuwu.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/bofujonovisudef.pdfIn PDF document text
    • https://guijek.com/userfiles/file/xogusu.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/80703439280.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/38696106554.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/65882568825.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/57193538832.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37a0e28a34---11255793968.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1e520ea0165d24f521d08233b33fd72d/panesuwiroxe.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/zefarag.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096ef988e017---womegametiki.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/89ca6b62430661bd08099251395d1e83/63911745748.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/24566629178.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/59852844725.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06025b44e---pipokufapobovitefisefanu.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/duzegikudizi.pdfIn PDF document text
    • http://imaginove.eu/data/Files/mataf.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/64941535521.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077135e19664---waletenejegodevipafavifo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8b6272c407b90dc5b01bf805578aae91/sagotij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=concept+of+scarcity+choice+and+opportunity+costPDF 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_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 17420 bytes
SHA-256: f195373ca507ce19284c556a1aa7f73b3f855b0c21489d09323b08bae3ff24d3
font_02_sfnt_off00014054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14054 10916 bytes
SHA-256: b26cf9c21318645eb98c0305e420597dd62ec720eec2dc6842bda3bb1f507e70