Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c82b9178a95e6e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 19:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d983038b50a0db147c3b5fe71a9e996 SHA-1: 3e700fd5a351917f9a7b5129552547ffc987103a SHA-256: a9c82b9178a95e6ebeb693a85c2b7601cd0d2bbf6c68e53d0ba05b1c4bf9c449
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to files hosted on compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117f6c7621eb---78830630390.pdf In PDF document text
    • https://greenfuturevietnam.com/Upload/files/duwaxanimobes.pdfIn PDF document text
    • https://mkart.it/uploads/file/95760300563.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/95272779700.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/8nk44uij2o3b9hel9jemncmkr6/9022378199.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/noxuwitekepigegazo.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4184d84368c674b10bb972318a55b058/9222895468.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/wakidatukifewifokezasari.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/df3b7c674b14df1b53e7a75dd8c9ef6c/92503958125.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/10300472361.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1cd9bfc6---vapola.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210720_f1b02.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/79920161777.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6b8829868---bupufuta.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb319e333---30457614927.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/nezotu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdb6b5641---19332744471.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/wubisopenimutuk.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc14cca0f9---rebokamapeligaminid.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/rozaxivuxawite.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090615072484772.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f953f0706---64520644590.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/14395642993.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/63520335563.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c293b27edc5---99287847533.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/81795320013.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/69753104672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=programmation+des+automates+programmables+industriels+pdfPDF 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_off0000cdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC9 11080 bytes
SHA-256: eac3f1524e6752aafd748fb8ccc474aeb46911f6732ddc5b2d90d1e94ea838dc
font_01_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 18632 bytes
SHA-256: e4a9e3cbb03fa7d1ae98ec9a5c52e01b889b1f65b9d25048872619cdb3cc7ee4
font_02_sfnt_off00011541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1