Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1cc9bd0ff56d51…

MALICIOUS

PDF

87.0 KB Created: 2021-07-04 23:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 829a3db3ec7fdc5fbb3f216c8a525096 SHA-1: baf5ae35557677822b545972218c1a183fdd99b9 SHA-256: eb1cc9bd0ff56d5188f992addacc421f4d9086cc5b4f8af70f07ddf7b4c99f27
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The embedded URLs likely serve to redirect users to phishing or malware distribution sites, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kingsfinancialconsulting.com/userfiles/file/46082549163.pdf In PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/11697e318b6b0dbce02c9248236f10f8/zutunuxovuweput.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c611067db9---72538374223.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dfa3a3d55---93609500485.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/591ogkjedbv4hkcv8079h1nv74/6353723903.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7b56ffb2747687edbe36ea30e3db7713/49227161799.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe21e2295---bofeg.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/bavod.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/i6vfkfd98dcs6ejbmeumkktmu8/mukovijukujixukokaba.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/nuvibabegudekuma.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/kodulexufizuvesudoniv.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106281237.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/baberakoteruviwivi.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/8540791523.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099211126f64---15459139275.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607960acc72eb---pewivab.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/2314521251.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/m1fudhvoqqmh5fqum583o474l2/worale.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/34347837715.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/kegon.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805efb937b7---wogoxusunoka.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/f35d6cb69ec838152a21e191a6044635/57466805222.pdfIn PDF document text
    • http://jngf.cn/files/file/degivejikodijuw.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/2071dba35ebbb79c8a7c0f4acd9b4cb8/pujufulepalun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+insert+page+border+in+word+2010PDF 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_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 17684 bytes
SHA-256: 820811abd1b98bb13310923c3eca3aa815c99473a6ab519c9e71f17cbe9e9548
font_02_sfnt_off00013523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13523 11032 bytes
SHA-256: 30ad7c78d51b9e6cd56147baefe16694f0e518eede56227335f34d400f6657f3