Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45aa362bb3ec207…

MALICIOUS

PDF

83.5 KB Created: 2021-08-24 19:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c37120d79ad237abd05bdf845847b4d5 SHA-1: 608b051ab29c4a1d09ec5cefbd00c40ef8eefdf1 SHA-256: f45aa362bb3ec207f5272bd5455b45e2fc4a4307080d8bd3213fb2b1b455921f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting. This structure strongly suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://allmassage.net/upload/file/20210619073044.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734d6233c71---20084011747.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a84401ed700cec5514f8dc37f6fd490a/32101724141.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/284c53ee9e390b5f50e7315118f0feaf/wisujawebivuri.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/70546065997.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/f0pviqpftf1uo0m30jjuqlvnrl/99713480108.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/93026685152.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/kejavilanoti.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/n9fdst6142v8ujgafqh09m12so/25655136331.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/gobajatokinos.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/jixabipozizufotuw.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609104a9d7a4c---27372995533.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/0e52e8b5daa8d47fb1e2f11755d878a6/43258984766.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/48957218125.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/91504d6cbb6627cba0b1d355fda778c3/detegerinatagijibevupan.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/66436032067.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/makepaxejinemegub.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace5e6f053c---vapigidumuwijosajelo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086fda51709e---99921964962.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/bogemuwexax.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c772d5744df---basubesosomomezamiz.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/setabusar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=are+titles+of+articles+underlinedPDF 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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 16780 bytes
SHA-256: 0477c6c9c23e08ffa06f61b4fb08113f69163f83ded9b293a79ab6bea9abd443
font_01_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 10552 bytes
SHA-256: d1f171305c30b9788abf033b2711ec61ae0964e662a8486f173891329c789510

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