Malicious PDF — malware analysis report

Static analysis result for SHA-256 442e61db2390be2a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-08 01:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10640be2b2c8ff7b09082bdd1a562702 SHA-1: 1ad10c6bc1125f681f6f1c4324797cd3f1b19bf5 SHA-256: 442e61db2390be2a5fef5b18e7a8d73c644521c3ce3917f25b002218749f2b85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://seoulsquare.com/userfiles/file/57269268591.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7122ea0398---82838329993.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/93857473606.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c2555d1b92d42ac502a0eb445fa0ff95/muserezerovik.pdfIn PDF document text
    • https://bataretak.com/img/files/file/96344324846.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/51743452213.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/7322746875.pdfIn PDF document text
    • http://topstec.com/d/files/wuvasamigokajuxisojesuwe.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a05117872f---tanuzowoje.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/21704854131.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b555940e9ae6f54a38950240547ea58d/68690345122.pdfIn PDF document text
    • https://nevisnews.com/userfiles/16620493903.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/10550695220.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/18971509277.pdfIn PDF document text
    • https://edusfera.pl/upload/file/saxewojaselamit.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/gupemegubo.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16295565689297.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/gitiras.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/dozuzupaw.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/96047347484.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/27463734709.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/76878148824.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/goribisi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/86b76a2b262f7b9e3835bceeacc473bc/44130802468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=shorthand+legal+dictation+pdfPDF link annotation
    • 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_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 18376 bytes
SHA-256: 7882e409aea626d28b53ac32d12c105e53bcec5e9025c34903e170d1bec97620
font_01_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 10804 bytes
SHA-256: dbe0400173895e018df488a34b171fea43b0f35c1ee4215aa71a93efa6b6e705
font_02_sfnt_off000130a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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