Malicious PDF — malware analysis report

Static analysis result for SHA-256 071eba42dbe87933…

MALICIOUS

PDF

182.2 KB Created: 2021-06-24 03:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 236a1b566b416babd9781254f1dcb10c SHA-1: 2944d87b08fe92f8839f88fa24bbfde713b0195d SHA-256: 071eba42dbe87933f3b3609f6e1b8a6b91de1a553d3da42a3f41a331d36457e9
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 0.9994

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://synerhu.ru/uplcv?utm_term=percepcion+unitaria+pdf PDF link annotation
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0bka5cvsdj5vfsq1vfd8ljer55/wexivikaxameteget.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/juzabatopalebojevof.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b312064c6---55373835505.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/danuvivuzojej.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608921f191bb6---89760502750.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/96976958162.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/81bd396c682c161c25c3f1757a6e0123/59661693123.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2bf6baa7c61bf6a5648dbf1b1cbc3f8c/61962178944.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/faa315577d0350e84d7af964427be923/1982084811.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609591afab32f---nedugapeliwatepi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942014b1c0a---1031206152.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66ea77f40---29925107040.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/83737795883.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002880c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2880C 1684 bytes
SHA-256: 50d94ef29ac85f6c4a083071b0dc69e6c423c073c0f9f258f9592e50426ffba0
font_01_sfnt_off00029071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29071 4940 bytes
SHA-256: 25a00605416fc95148693f82c3df2a1df02928f5b12bdda60f526322337d6ae9
font_02_sfnt_off0002a152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A152 12272 bytes
SHA-256: ff6dcb6ede907ac112fc6ab8c84cf5955ecdcbe4f102d4a53d915d6b3982f33e

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