Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5915188094312c…

MALICIOUS

PDF

87.3 KB Created: 2021-09-14 02:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d48f6bf07cf2a3d02c0307f2eb7d536 SHA-1: 207ccd0d4cd43c540b391327e108ea499474d359 SHA-256: 6c5915188094312c64919f6d93772885e63becf1517a8c8e9d5b7d86a30abefa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to various domains, many of which are hosted on disposable infrastructure or appear to be compromised WordPress uploads, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://utcsp2.rustyramone.com/uploads/files/zebovi.pdf In PDF document text
    • http://grimastone.ru/files/21503086936.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/mogikexexafudemesajeti.pdfIn PDF document text
    • http://3asoft.vn/img/files/paxusubore.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/39d99db1adccd7bd7115375569b30492/8772496418.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/90737084819.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/79928543919.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/91463935346.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/75365210749.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161398e7bbd586---8638184578.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/39a0ebfcb49e31d4084681ddaf0e2d07/14873952790.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/177718478.pdfIn PDF document text
    • https://producto.works/userfiles/file/worafixowunozikurufatinir.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210901_FB0B5C8A6153D3C2.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136acf6597b1---61139930539.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/85361856112.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/kuverivujaxiwotagesanama.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/visufav.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613484f11cc88---pegivap.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/12418717493.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16133316b9fd03---93446919670.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb86b0124---komuserexiwifafimajawitaf.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/36928632442.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b7ae8613d0d61db26019a2f63a29e616/tafusasevuwawowuxus.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132000b420ca---70753841412.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/mawupiriruzafur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+localization+language+codesPDF 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_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 10684 bytes
SHA-256: 3fb85ddaf51e269b5ba3d0fe9af1adaa5887185c6a0440d9a2d3dd8edbd8499f
font_02_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 17812 bytes
SHA-256: 6e6bbbc835b8e3617d2798e6ac6fde8527700763dc9de9920c137b467dcb5fe9

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