Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bd60583510090b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 23:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5d502a2cdc287f4f6ecb9d2a29b29b6 SHA-1: 3a7fbb1d8a16bbc80f45f0b805524cf6a122ad85 SHA-256: d1bd60583510090b311b72bf9c7007fd597c73ebadb0f6875f1fa831516c55d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicates a malicious intent to leverage these links for nefarious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=how+can+i+find+developer+option+on+my+phone PDF link annotation
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/nuzoto.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/gurun.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/26513230640.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/90773230649.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/58609303718.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/87934604230.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161413883cd238---60601415610.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/zofufuboveg.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/31139116148.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/28345915574.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/kosedexaz.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/digirugewosinemorazezabow.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/52160615350.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/mexewinexuronejuxar.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/74887548218.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/63292408292.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/20575088021.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/pigezisiwikol.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/59945546744.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614416f398c4d---duliloradeger.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6cbc7127---46644033284.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9358d0446---vajapomanutuxozefanow.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091418220573499.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_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 10976 bytes
SHA-256: 8f5c9b5b9abbf4935d4256fe844e071b59af7362b9165c3b26f599f90208a81f
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 17388 bytes
SHA-256: 5371e5ec26883f88d06aaf2dd374aa7f5957fa784cf61bc72e91d8b268b99aaa
font_02_sfnt_off00012462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.