Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65f318972c6d186…

MALICIOUS

PDF

124.0 KB Created: 2021-06-10 14:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 88a744c349f4358ef9af7a8bc1424325 SHA-1: 3c84b7b231aaa17f49695a1ff1fd2fb0a9fa9e3c SHA-256: f65f318972c6d18637978a1a82bda9a1b4308858c803334daa1dd4782669294b
156 Risk Score

Malware Insights

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

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 0.9998

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://queure.ru/uplcv?utm_term=allahummahdini+fiman+hadait+full+dua+pdf PDF link annotation
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e15a448b2cbaea114611f475d4d0f04b/beluvajorezuv.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18062f6a3---vutixasideluz.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/g6c6sjaccreioicbvl8uud51oj/wijavisamiwapozudopi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad01ebee3---8311443241.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a91e6b6656---36616000621.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/97094857801.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d3f349949---94116925110.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/183105fb15f0d14011767d0b51a64568/84239594985.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/44659975199.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16085e7d245b51---71374244076.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1123da655b5d857c39076845ad1d08e8/gapebepegonevusixu.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/fomusigumatitodu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/759bc26de657adc8af99a87838dd176e/sexugipalidenujakevufami.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/18242588616.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f9aba1d1a---noliwovafopoferuvixu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001b384.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B384 25528 bytes
SHA-256: 58579bedf277d5545d8241d3b25a64039b2a528a186987f8ed31adeb1084d9b9
font_00_sfnt_off00017932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17932 4996 bytes
SHA-256: c5fa1b67b86c22b63bd6f483a0ba4bc5c204d00db144073205e4d72708d1b49d
font_01_sfnt_off00018a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A0C 12124 bytes
SHA-256: c64daef4b21a7c9b761a050ed4946628188a56c0ae0a7d2a7109ce768ab0a4cf