Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd197a4887cb0616…

MALICIOUS

PDF

71.1 KB Created: 2021-09-05 10:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ebacf72d85237027234b5c41759f7386 SHA-1: 4fbfa22f36c3dc1681e94422608b61856df4915a SHA-256: bd197a4887cb0616ddbdaa8b89a1eb8014b7c0209dc6b946826dac00567d7f11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or trojan activity. The primary attack pattern involves luring users to potentially malicious content through a series of redirects hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df994cda7---gagusekidus.pdf In PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/giwazigezixavelov.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/052e1a310e82d8314dc220f612086ae3/85575517417.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847a7632097---misuzavude.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/tetepil.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15759c9cf9---92292587389.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/togubimarinesukaja.pdfIn PDF document text
    • http://ipublicity.cz/data/file/ludegipazum.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d262c446cc750c9a2791e41eb4523b5f/19256176972.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7353343176c1f6098d19ab70277fa3ad/kigiwularexosirojep.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/soposipojakag.pdfIn PDF document text
    • http://nprofit.hk/userfiles/69552644856.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/62915380579.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b8e4fcb834296f0a6693ec5a9a76c097/likeno.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6768228ed0eebec7c667098f201fe778/basogiwixakuwotitekiwewa.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/rijobofobawetogukisaxedof.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/27425190498.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c5df4738b---wejizixizejowa.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b111a412f03---94981970237.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/jajuwazagopatadoj.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/niralagoparig.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/47787363923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=faith+towards+god+pdfPDF 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_off0000b703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 10556 bytes
SHA-256: 0d06bdef1d6b7e1112f212685e29e07cfc260efde35aea3c4a05b7430d88ced3
font_01_sfnt_off0000cf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0F 15632 bytes
SHA-256: c76db27ab0ecff5fd8f55b3ccadf30e2bf5598c947403a537287f7a0bb788d23
font_02_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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