Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53726269c9d9023…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 01:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88366babdac737a7a7022d56ae4aae81 SHA-1: 6febc7fcfe00ab2a4cabed3fba18de0d5eee0493 SHA-256: e53726269c9d9023f32b443602bab0d30ef5dd080404ab9a48f9e49987fb6f5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and embedded links are characteristic of a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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=instagram+followers+by+malik+vasid PDF link annotation
    • http://thestarbusan.net/FileData/ckfinder/files/20210910_D6B2F7596D059D4F.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/buxavufepul.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a01a944765---pugaziw.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/32301464809.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/kojisesupowudaruposob.pdfIn PDF document text
    • http://rs-entp.com/upload/file/wafodororoguvawuwojovo.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210903084513.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/98ca54c8e2911dc55c6a2608b3480cbe/zovepulawe.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/a1kl0ohh0d4o9k6s7rsgk7d7da/keduxegiz.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/73688352315.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/kufidibajukiruto.pdfIn PDF document text
    • http://heizler.hu/files/file/80320482991.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/33126287110.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/89870561245.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/63581016237.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/93935956472.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/14557923616.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/26941091940.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/98332714281.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/wufasemutinafip.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/bosokak.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/jinakekoxujolino.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/zewuto.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/17391739946.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/xoluwujewozopopiza.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/17965052826135b39aa8e23.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E8 16376 bytes
SHA-256: 6b7158bde9bcd54c3342b08941ef0e41eff247434e84e35f61da297978e1aa7b
font_01_sfnt_off0000ca6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 16256 bytes
SHA-256: fab29b20439884baad2f929d851cfa5543edecd598acea60139dc7225406dbeb
font_03_sfnt_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 11144 bytes
SHA-256: 1bfe2bb3ba222809a54b805783bf1e15d92170fd0442f72041a5fd225899a85d

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