Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4aaa5d3cea5ac11…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 05:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d110828506f5c65f7810b8b133d837c6 SHA-1: 4b528ccc7b764105ddfe1e7d967586375f9ef1ea SHA-256: e4aaa5d3cea5ac11e9ccce00af1469d2f57a3451f67993d938dbd2ec53f20f34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links and the overall structure point towards a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=wagner+airless+sprayer+plus+240v+manual PDF link annotation
    • http://aliceinformaticasrl.com/user/pages/kozover.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/58786550338.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b227302e393---jelutuxunudogonekufel.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1ab4110e---17268292847.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/20046379356.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/10e46c6d36240c187572674fa6f118dc/25134452112.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/84f75280e398fcb985e119bd71b77e1f/wowuzifimevujewu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4d537951---dunopifudezarutavu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cccd410f3---58420895948.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16078c1b1083bd---zekusozunukemada.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/72722505505.pdfIn PDF document text
    • http://vswet.ru/f/fujofomu.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/mutobigitipuvuwojinuvo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa834678c4d---pudujukema.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/54117590757.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cba963c1c---sepogubamuve.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609c26d700---47913164143.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/31346416364.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/jajedewo.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/kapejijijop.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210902041006.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/52881527115.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1067701e2---76816343021.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/kanaran.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/pozubijatuvixufikamezatam.pdfIn PDF document text
    • https://lapdonline.org/file/rotuwu.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_off0000d343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD343 10968 bytes
SHA-256: 9c246c98c57a2c83ab99569a08e27ab979c78fe3d6145b76d70b147cf714c8d3
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 17392 bytes
SHA-256: 50e980ea06a0db17462f966b1d5553aabf22e374a7c5e6dd83f7e40ca1ffa4ce
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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