Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3d09b34741e97c…

MALICIOUS

PDF

97.3 KB Created: 2021-07-15 23:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b7ad9527dec82acb735b424d09af1d69 SHA-1: 167d07e5d5be9805e48482be2e421873d2ab9550 SHA-256: 7e3d09b34741e97ca135f5b76d1a447b2efe8555d7a55d383a93ff796018e6da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/81099598531.pdf In PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/bogupaxubujajopusixolof.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d9f158c8b8---wodiboseludevogasimud.pdfIn PDF document text
    • http://kelvista.lt/images/files/74817779161.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb56d6a0f5---53171180416.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/32519430.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9ad94c2bf---xidupapojeweka.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/zitojurebegusulilizo.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/bezexatarefevizuvopokemi.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/pubuvaki.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/19528036193.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/15698648952.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/jixuwasegof.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/35bf1ba43782a5668b01b0fa50b15f95/zijegiditojaber.pdfIn PDF document text
    • http://congluc.com/upload/files/dimilopubumufokufubov.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160959906307cf---55705772034.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c95e955f0---54770424247.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/saxerov.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec7317ff2---38311436323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=interact+with+each+otherPDF 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_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 10148 bytes
SHA-256: 86dde1ad27cdb944acc9344fe883a95c7a0f62a88f113359a571c959f468fc1e
font_01_sfnt_off00013467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13467 16944 bytes
SHA-256: 839d190eecce6c757ea3f7bf95f031598ac135c48cf8152a47543e0a8c39e0f8
font_02_sfnt_off00016048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1