Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5db471d79d6558b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 21:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 606287839ab08b8380c80da89149f9ac SHA-1: 87559d1bc9198f6c0283f03b057d4dc448c7d43a SHA-256: d5db471d79d6558bb4fe93c654e0249fab40f7c2f069aa802b430e44b9fe09d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=how+to+hack+someone+with+their+ip PDF link annotation
    • https://vaynhanh365.net/contents/files/wudajovufinuseme.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141619a9758f---sukuvadodesinatedof.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/70134889719.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/77691030939.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/58067449118.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/76700085647.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jazodokadulibuwemidivuru.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/dunixefuwur.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/3259377121.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614185ccb8f10---livonafumudopuze.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/guworenikosilexopene.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t7mjcb7767sv1m57gkeuvhtbng/saxuxodutudusaxosozopi.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/vepuxakowi.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/40955575418.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305bced9ebc---sirikifuxewubino.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630669512bVQp.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/70022843150.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/725ef7b3fd6262bbd0bd42d4c1556337/56395906579.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/3533427970.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/41a43e09c18f840ee67b8f87faf74f7a/25525500306.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/maxoxagegemaf.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/zobesupujifaxowugi.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/sobugumewefevajaz.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/14434690393.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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 18008 bytes
SHA-256: b1d63865b641a420fdaa26a2d15ab22f01c8e76195bcc0c2e63e09acd5cfb6a9
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 10760 bytes
SHA-256: 08d83848245abf75427b0563fd345115472d229d307caa2d07c7af31d4d0305f