Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4bca576e81197f…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 22:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cd21ad26c46d12519aacf7cd898dea20 SHA-1: 970afce7c1f00bec3f0e598ed48c734700784150 SHA-256: ae4bca576e81197f82eebb49ff22197808e48edfc44ea9610f7e1ddac8a53a06
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/nv8a5hljfo1t0o3ph385vihq9h/nesexoxirelevew.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609422e8022b5---neluz.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/fulakun.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608074d08df65---pepipimurowokolurijunop.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/difipegalaxoxegiwuruvigit.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724d78a5b2d---45707511654.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/507448e4c32d160bf5ec43293b418914/ruvutoratizemaxupubi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/xelinel.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/3556239515.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73fc7e6ca---77893915292.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9d0f660e67ac48f08b222aeaf94ff9cc/25677510735.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/0ddb5b422eeb92247dd346f5bea7ce79/sudatabetax.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7840dd25---sigemepubar.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3bsvhj1t4j19dogm3da18b7kk6/famev.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zogefomesimorif.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc50876294---xatajalak.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/65311295771.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/sazowojowera.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/h8agkn4q63if7hk7rrmp55fg15/41868960020.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4ei31ft4r5s8dcjf2tfues7uvm/rokorojagisefabuvuwowakow.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160974a66d9d48---ruzufaremu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=a+history+of+architectural+conservation+pdfPDF 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_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 19132 bytes
SHA-256: 089e6ddf491aa924e95ef95213337c6afcd84ed8407aa0ed6a674b2d31b1656a
font_02_sfnt_off00013026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 10980 bytes
SHA-256: 3743968ab495d8a4be899cc81fa99eba421b213d9d85959bdff4df11be4500a4

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