Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e8ba19b4a97e77…

MALICIOUS

PDF

162.7 KB Created: 2021-06-25 20:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 151b192b775858ea50147526cc7c142d SHA-1: f28392be9d99359424be53ba250c92468e53cc92 SHA-256: 04e8ba19b4a97e77f26e2b47ae59c7444742c865f997ec54a942e054d7680e20
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content, further supporting the idea that the primary function is to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

Heuristics 6

  • 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.
  • 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://dekoblickfang.de/userfiles/file/mekivuxabisilibar.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/eec1dd148595a18f3b601652923af834/tarurikidazuzorumi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ce69d8dbd---xizepojijisolebuvaxaji.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79bc179f4---fininozezosenuzizujuva.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qdrd3fdq5n2djqn5vn0c792bj3/7162460589.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sobojekegezar.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/kofuxolipugesapekibodose.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098464039c94---24739660406.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/polidisimotofulod.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/48ea4b330b3ae832a3c2e3f059451343/vajaposoxinojunoz.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/wonanebunasidapulamom.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845c8a10309---ruzojemavaketutifiba.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/hcaak3apvtqmg2r88pimvmlnmu/jajazimelufadevajamisinor.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/21563457021.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcc3214b0f---dekivadiwezogofavav.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609100e8080b0---kowigolujuledabosobuxiwo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9279e18bdf---xuluzurek.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160854ecb014c5---15006310108.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d266a82e2---nuzutamixoges.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a61049df03---16381615974.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c172bf0ba47---29482669376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=data+structures+and+algorithm+analysis+in+ada+mark+allen+weissPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 17984 bytes
SHA-256: ab27e936ec241069ed3413ff7762dd2bc8ee96d5e55a12ada2915d53983f6f01
font_01_sfnt_off000150d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D5 11208 bytes
SHA-256: a4c0ff98e33dfa703a1b2af628e04174f31b739b505b8a85dda906022a512dd2
font_02_sfnt_off00016abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ABD 101264 bytes
SHA-256: 7f5d07666949f63bc2dd996a18a32491ce84a9a894bade4a65b2ea702604a94e
font_03_sfnt_off000264a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x264A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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