Malicious PDF — malware analysis report

Static analysis result for SHA-256 507667eb3e108251…

MALICIOUS

PDF

69.2 KB Created: 2021-06-22 12:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d588b8f20a262bcb544ca19d38cdf683 SHA-1: 3f88a2045161eba549f2e1cb13c32b8282f1928c SHA-256: 507667eb3e1082514b2709f23562945bcd7e6ac620f46a5f83aaee9955922dbe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan payload. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malware or visiting phishing pages. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/443f4cfd60a8bd18f53825774dc62d63/fixegunabefebuvijabapigow.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b054c4c924---salojogetowagejegufo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/007b6f358e876f5d82af9fab96252098/ruvijakeravorelekexolob.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dcc3c3ab3---bixirubikirisip.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f9148e79cfde649ea72abf0ea13549e1/raxaji.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/3668440809.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/75858898830.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a835fdbbee9---79751567881.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/44056248534.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/27919545367.pdfIn PDF document text
    • http://yjccnc.com/upload/files/fukumi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f230e8c36baf66e9c13f4a0e85fd2387/43012044929.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e96fdb94d5---79809888979.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bacda51041410242a9db2c1512ef7b9/57837222018.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/5516344345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=future+all+da+smoke+mp3+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://scripts.sil.org/OFLIn 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_off0000b90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90C 5380 bytes
SHA-256: d3b070d6e199c0dd6a650c48c9a30ce8d88bf9d6d9aab68ccae394a5677a79d5
font_01_sfnt_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 11668 bytes
SHA-256: 00932b2354b42d1bb51c6c5f64e69e68d577f6153ced84b85bcafc37c5ed803b
font_02_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 16144 bytes
SHA-256: c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b