Malicious PDF — malware analysis report

Static analysis result for SHA-256 756a5655424f27fc…

MALICIOUS

PDF

94.0 KB Created: 2021-08-02 22:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98ad5b4b2c269fb78857baff23cfb168 SHA-1: f3ae89e259c68583b33bb18ab410e3225f1c627d SHA-256: 756a5655424f27fcf92c01a2daae9515e0ebfad4b21f54a9cac5d790ef6926a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or distribute further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d0549cb39c1ac72918c577c6b598242b/ziwudutagisadiw.pdf In PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/zosajunalamasivujulaf.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ceefe69ab---joritu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fc497629470de756067b8f3abe0850e/fazedotagabixunobumub.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8affbef0e385ce3014ce74306cb79bc3/66869210370.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/120i59fsuvd45lhasqoobfhqo2/kebomapibowifiki.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65cba2809a---61109330107.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/93904498213.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/06b132601b330daab6d03b71c1027cfa/16295062028.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/gemobixo.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///2836702716.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/29967537152.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f850d52de1---fupudegu.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/afd543if8pknret07lg37um30q/95684203615.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/22594448165.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/zawesewet.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210726_746F8EDA88B97B6F.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/mexodinikibolugabin.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/xapalefeneranar.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/jubiga.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/bevuv.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/buliverifaxoxefo.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/budusu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b173e115b0d---zuwusagokaxakawidexika.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073481168b13---38510016342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=proving+congruence+of+triangles+worksheetsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_02_sfnt_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 18936 bytes
SHA-256: f4bf17da02186f804f644c975de2289a838899e44d3f26858d81a55369b374a7
font_03_sfnt_off0001504b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1504B 10960 bytes
SHA-256: 7553b3a7855a7e4108c22795d648514b5bb4921bf6a3229c43116c40644bc793

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