Malicious PDF — malware analysis report

Static analysis result for SHA-256 1398024e55ef0575…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 21:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d17648742a19c15a45824d7e893b987f SHA-1: 8ed54bd5fbe98d3de7f07c30c9fbbcc776c5d886 SHA-256: 1398024e55ef05759d0b4fb89aa5107aa3a5004e908b65f49ac3f3ee661ec4b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains commonly used for hosting malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure designed to lure users through search engines. The ML classifier and ClamAV detection 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 https://philabc.ru/uplcv?utm_term=autobus+messina+catania+aeroporto+fontanarossa+orari+pdf PDF link annotation
    • http://tradotel-riviera.com/file/duxapefadevaw.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/bevubesiro.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/48577869443.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/lizazapodonalapizisa.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f2a450de4f5450b2b235b3f81bacf320/mupopezib.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/pikuxipaxawu.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/46355651046.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/99751768014.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/pitujiwexurewomadu.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/59494140450.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/gogazibimijaziwurifalar.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/87688975050.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/14071831179.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/pagipeliluxo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/6191829819.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/repamexopuvi.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/wosaxasumonapovojaj.pdfIn PDF document text
    • http://bubb.cn/up_file/file/62190895503.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130817a65f2d---21719854489.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130741d9064f---wujarebamirutoranevibewak.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/37270357368.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613227f6bb48a---17708005207.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/julutizutetenigepifo.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/moxejigunejadoxo.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_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 17756 bytes
SHA-256: e78c21bc887eee3dff2341e3991ce23087ca2289be24a142b14d895b0e8e43ef
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 10956 bytes
SHA-256: 0ecfc0aa2537469f221141acb63e98822bad7bf40e126683b86cced58324db6b
font_02_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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