Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51cbf1184fb17fe…

MALICIOUS

PDF

88.1 KB Created: 2021-07-23 01:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8290edc1cf960f642d0685ba5ec45839 SHA-1: 2a2ee14253bb03aac4e5442b1db6a4ac1c57f457 SHA-256: a51cbf1184fb17febaccff9a72ebf409d9e1967f4fa432053e532b79bd6af424
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier assigned a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://animalscipublisher.com/files/upfiles/file/34696674458.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609889ae87b7f---zimibetat.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b15c9e38---bobovewudosipasuseguze.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/suzujufexipafidinevuzudib.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210621065844_582127342.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727f540a298---tukaxorusagefunenumen.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3445b2da---19695268893.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/9559896045.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0d26152d0---bafolajet.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/mozojepafukizat.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/face74ecb3393a3b4f9764b80c5e0390/bejutivoxukesivubowi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b559405d---83762685353.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0579118333861cca82a938d574949a77/severedojovupejunun.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/018030d22618f9a0f23cd4f1110f6aea/zinenalovojime.pdfIn PDF document text
    • http://jechtinger-wein.com/jechtingen/files/walojogi.pdfIn PDF document text
    • https://unosms.us/userfiles/file/xizisizejeniwusosamuzeto.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607556309fd07---85314157575.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/magexopakalufi.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/wimuzowijoxuwibixigo.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaf9ce6e25---nidifarasu.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/89459565515.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607edfff9d086---58256418626.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de8a077cf0---64116742093.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/v0mcdcvifghr2n1j0gfj1e96o6/mutiwegotitasevupilok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=del+valle+hikingPDF 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_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 10060 bytes
SHA-256: 6326e9fdc41b486b175975d59a34876c698b39d0ef2ad71846c1ca6ef0ea2f2c
font_01_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 17468 bytes
SHA-256: dff2d67c22d79cb454ca7b064e8ef5bb280d5d241e6399c3de75f1a05e3f41f5
font_02_sfnt_off00013a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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