Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc12f6a9595e5fd8…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 13:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 021a8726b76419fd32cdf15fb1839998 SHA-1: 9c8980b84869d88b60cc9bf8d7d376a2702ea2ae SHA-256: dc12f6a9595e5fd82a4008e6a280fd04946127bcf4cecbaefd9ae22ad685d892
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://smidgel.ru/uplcv?utm_term=the+joy+luck+club+torrent PDF link annotation
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964ef21d970---57417900879.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/n531ibjom9eh12jl2t0i3gqchp/67136263724.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/kadepa.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/xodeju.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/56040888072.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160790bd8ec21a---molarozimotiguwatupodi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa55c6be4---41341494615.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8a5e8a0c87bcf7dcdac6adbf9965b6e3/kefijolaniwewanebiwap.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/bamegku2pdi737mrti0ud83k07/gazomejekaz.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/ferebizedusamifalo.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/10898331506.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/sutepirunudasunapomelokek.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/movobok.pdfIn PDF document text
    • https://mihalex.by/files/files/kewaragotalir.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/garibixokurozibumojela.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051804073383642.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/73166045765.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608205cb9fe91---1755673390.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/metaselutovodavabozakag.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b6cf23be586697d330598cd6f86ad6cb/miniduradoku.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/kifiguzezogobujevuwedevil.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/digoxurokow.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3a3add86---33814582358.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994bf917930---gojexogikikuwonatokuj.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/41089664729.pdfIn PDF document text
    • 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_off0000c023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC023 16796 bytes
SHA-256: fcfb1a676a23beba3484d6e9d3931b7757d37a189479173b330a7449197c01b3
font_01_sfnt_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 10444 bytes
SHA-256: 6693a2d1d16dace93bc0d7654507c5d5ee0c17b9a9b50212cf45557167449b72
font_02_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1