Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8461b5b2b0db8df…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 21:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9740aba3a1c694c8a7647212a953cdf SHA-1: a7d1d06db1fea4295ca682928c337f082fc154ab SHA-256: b8461b5b2b0db8df5139170d9ca414b912c9d7b14ca1c552ddc6b74b1fd10f6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=st+joseph+belmore PDF link annotation
    • https://sportnazona.bg/f/uploads/files/jenukudezumarojemeb.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/66837918094.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/33672825602.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488ce6c8cda---vuxobogi.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/senibojilagulalevo.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/bemipikidowuva.pdfIn PDF document text
    • http://pnalog.ru/images/file/vuzikep.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/rurarinafam.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/tawufimubotasipanukozuzi.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/10906737902.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/26579236831.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/tanoxajobosojema.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/42205375065.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/83922492362.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/87443190964.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/zotezimuzaj.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487c4abc863---basugawalejola.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/83147705835.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/76770272037.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353d035edaf---fakuwaj.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7mrdf2ft8icjpo8qbmbufic2mf/zetovukuvixojinuvobolik.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/gakosejodumijilepefuso.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/visimotunutejizamamamadit.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/nuvukuwiwigomedevazul.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/84943713546.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_off0000bba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA2 16744 bytes
SHA-256: e31f0c0dc7ce9a216aab71013894915e2aba71d26309aacb1cfbb654f777558f
font_01_sfnt_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 10504 bytes
SHA-256: 854785a3bdfdbb1b59ec85b4b43fbf31e57a673102f769a1b9d878f642f37ef0
font_02_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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