Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98444f23589deb6…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 16:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d793b7f58fe547ee8e822c91f9f6867 SHA-1: 5d27e8d27a624d800686c45359d7f82df4ec1225 SHA-256: b98444f23589deb68649f5f54d9b3ebc2e074dad36d5907867f37cc3f4c6e3a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to multiple disposable hosting sites, likely intended to host malicious payloads or phishing pages. The presence of external URIs and a link farm on disposable hosting suggests an attempt to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=kitchen+scramble+download+for+android PDF link annotation
    • http://china-guolin.com/filespath/files/20210908154545.pdfIn PDF document text
    • https://penzion-palice.cz/content/26662489146.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b85c0c61---malitusesepipogotine.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/20972945607.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b562be775f858639245610dd86816532/wexujabeseze.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613105dcaf535---31244115284.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/wisubijefamiritu.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/33525369845.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9d266d6e9---pumuv.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/sipasojipadivivurudulineb.pdfIn PDF document text
    • http://nfc.soo.jp/file/kokumekutekividotidege.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/15566620558.pdfIn PDF document text
    • https://siroyensao.com/upload/files/29561819592.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210904_045311.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/vojuxigudujeregaf.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/parilunediwinazixudebez.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/mulumexenitefut.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/vogujagidiganilepovizej.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/22323739091.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/67531096725.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/70958558071.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367591a6105---94594731966.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fee27de10e---99845794752.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5A 15876 bytes
SHA-256: 4c95f5fb7b8d471c5718d82fae96110a5c3f43e8ea678f6c22cb45a73a30cf86
font_01_sfnt_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 10956 bytes
SHA-256: 7bded67574f01da5492b2759f0e8c7f86214d9a609b4f4de1b975686c28be492
font_02_sfnt_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1