Malicious PDF — malware analysis report

Static analysis result for SHA-256 49301df913ba5934…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 05:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93eadf818bf8dcb33d33f82bcad50793 SHA-1: 09d9fb83d5dc40d13b1d55001a9923cdce1ff4f6 SHA-256: 49301df913ba59343ea85ce9ded3c96cedfe60b8f534bc57a3cf21183bc5aa0f
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 link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=perfectionist+test+pdf PDF link annotation
    • http://dok-vo.ru/userfiles/file/87899953124.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9peamcbn39atias5n13lerjgos/56823775822.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0b23631966bb5c23a6e23ee6d1815f5a/66287099605.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b902a59d78---28832574855.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/38kcernep9ge8rr6u3qe7kgpuo/wodilafazi.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be7698689---sidow.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/mutizafanazexugowaju.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/poviteluda.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/63041290712.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/misoruxopi.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/deweg.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/71955941716.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/begabetazoxawekozuvisa.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/fulojawozu.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/12771715237.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/naroxuvofusozowudele.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/goretarurimaxibonexux.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/54887375042.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5640db9358---jaseloliwug.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/41652444156.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/kufepog.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26c5691d68---duwijoji.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/zesozelolowijarib.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/58224770008.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_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 10408 bytes
SHA-256: c4fe7fd71f131a3095393b75fa58aceb6e1688b1db2fc85273a18ce4a05d18b8
font_01_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 17272 bytes
SHA-256: 2333c484c065c39c1b27d33cc8da4ddc47c2df818d2fc93fa93d240917b056a4
font_02_sfnt_off00011f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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