Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebbd31751a55e9d…

MALICIOUS

PDF

87.6 KB Created: 2021-08-05 05:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2212e636c043e60d10243183b375fb51 SHA-1: 2252db921b7c0ffa14de7d4a580b53512461217f SHA-256: 4ebbd31751a55e9d3e5456dc172b5ec7c1486cf0ae1938fde8e6997752df2e99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS uploads indicates a likely attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/1182823f1a4ba120edb233172b9aa3b2/mazodukilerede.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/02046109a5d6d9876f5c5fc019369c6d/54647848899.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ddef6ab38de058485bba1cc0ebd1222f/bogogumikiwanalalavomiso.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/30771547195.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/73041948392.pdfIn PDF document text
    • https://actorconseil.com/files/file/mitikabanegofuzix.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/194335937160bb50df30752.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/65265373035.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fexomipolawilazabiz.pdfIn PDF document text
    • http://teakdeck.pl/files/file/zanepexajobojemefepe.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/rofare.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qndi85rpiovu6ofcgm4gqi9sua/41578848890.pdfIn PDF document text
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/josofoxa.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/bcai3rfuq5ao86s4qvq9rvqjdb/vunozow.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23e89ef78b---nogavafe.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/96961346918.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/6f1ee386f75b463acf77ae7782fad130/zizexevoladoboni.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce8985d60d---70329591480.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4836daa6dc0237097468ed987a44fb0c/56793046639.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/51610905643.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/64965398755.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/n0jt2ucv04jg8hab303hg2aid6/gumonawiwozowokuza.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210803181515.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/15134307679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=locomotion+jacqueline+woodson+summaryPDF 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_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 11064 bytes
SHA-256: 2ca582098331e9e12fa43640a4e2d5d5892a3627c5d13ae16546dc197a00377e
font_01_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 17140 bytes
SHA-256: b818ae1ed24e24783be1d9a9f549736b3c75e90d4d8583d0e14f1cdcb273eb41