Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee66d180fe497f2…

MALICIOUS

PDF

83.7 KB Created: 2021-08-26 00:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d76ca9bf2d40e505a08aca07021a1d46 SHA-1: 17f5a8db360d1a5339ed3c65c927e5cd55835033 SHA-256: eee66d180fe497f2bbc58e7c3aba252f9defcf7fbefce467ec3410f35a5f4a86
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://georgewongdesign.com/gwd/upload/files/fotetibimefatapelolim.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f0745b6a---54304830382.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/52951028470.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/12230279025.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160efff11b13b7---posugu.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/36442283936.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c4ea2b901---xanivewojarefo.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/59604290006.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/82407047090.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44fed5b3b9---wujabumibixazatim.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1s02vuvunletaa6n17csq2kga1/14126154763.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7085e2deb1a71eef386c16c5b2b94a87/kopubamatokezufo.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c338k1g65v5ae7es01vnfdjoo/sakalenadalomafux.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/jimugewobefo.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/99v8uimak865rregp381c5cur5/45321072668.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/82305681946.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/godoxozeziveforesek.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/94161592110.pdfIn PDF document text
    • http://kleiberit.ru/files/file/53342059353.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/nomilokejofujumofijik.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f562c21cb---84305417548.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c14117ba---pozesux.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/98634504899.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/596a44723ff73b059fb96fc70d8baccf/siwowaniligavebametexake.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xofibidukuvuwilaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nand+sr+latch+truth+tablePDF 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_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 17420 bytes
SHA-256: 72b17551a87608d4cf39e6441251dc04b9304c7c98b60cdc0010a5d51553a5ff
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 10472 bytes
SHA-256: 20ffb5fd8ebb373e0cc9ccd7bfd6059434af21efec405e2f4e9fb6dfff13c428
font_02_sfnt_off00012892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1