Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9cfd03b5d9cfcf…

MALICIOUS

PDF

86.6 KB Created: 2021-06-19 06:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 25557f805c69b9293b66310aa190f4a7 SHA-1: 187ae38bb21ee11d35761bb3435de6eba3d90911 SHA-256: 6f9cfd03b5d9cfcf2fe34e998560f98945f052c48e6616483d0e357b1bca392c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading malicious applications. The presence of external URIs and a high ML classifier score indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=dokkan+battle+jp+apk+download+ios PDF link annotation
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c294a57a7---72995111978.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2f4atisnkgvdputsmtv4vr9fc3/kapexunalewipugewe.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/582130b0e5a802ad10051cab2a8be610/midiwuto.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/83385776276.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/16ff97f13641c4367ff121344d26357c/32297818525.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/93213453800.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/wuxex.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ib40m63bmqv5t4p7ibhes4kue7/810807675.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a843aa688b3fc02bf0692e8ea8b96c63/24726641261.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160740c7eebb9d---99734477948.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ccnam49lls6ibn4t0srg6m48ml/9207652853.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/zerizudenovefezali.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/60afdd8404d0230f27fb412598435ec4/79923075496.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/2998588989.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/metivi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/40514565f89454e55c02208986a19c3e/jurijelik.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/85439460931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 6020 bytes
SHA-256: a09035ee294d1888a50d57e500f2cba34c131cd09e9d914975731f388141d6d2
font_01_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 5228 bytes
SHA-256: d66e247d9db5ca77f047bc834d310ddfd7444bd5d239420eaabcddecd03fb9f6
font_02_sfnt_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 12048 bytes
SHA-256: 25a74f441ac1ce5c7797dc7b6aa49672604bfcbc1418680f4fcf2b316095f8de
font_03_sfnt_off00013619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13619 16456 bytes
SHA-256: 5819185e1b66b6c78f35289265c29c056bcb7f5041ff70327ec1312a2173b48c

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