Malicious PDF — malware analysis report

Static analysis result for SHA-256 48980bd6ff6e8563…

MALICIOUS

PDF

74.6 KB Created: 2021-07-08 07:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 55937e4e16cad427d07af593626eceb1 SHA-1: 4579c6c6c95da195f82d9883e700703fb4fb505c SHA-256: 48980bd6ff6e85638871bd9ca9f9b9874cc6d6f6a8e191446dd54818cc5b1252
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c77bddf39e1---28871049528.pdf In PDF document text
    • http://recko.ru/ckfinder/userfiles/files/rizob.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/nuruxujakuberovoso.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/96467912124.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/36556151752.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/95818827803.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/gilogiraterowawebizitiseg.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff9dd0172---23815390053.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e713537d20a8bc4c0bf81c7a1922be83/repewijovome.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b220fccda5---rokixijoxijovuvedam.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/87438389330.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3f798805e3ab55c0a5585a9b6e74338e/45267114027.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16099b01fb4027---27112315041.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c8f2c4d7---gomiposomol.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7f677519936e75f521af4018cc9c4ce1/75239561146.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/23723093083.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/14f7b9952338cb5890bbb6aa4a8c5db5/vesizulolojidenufodixobi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/517bacc04398de28c3a1f33c798f8651/27364644877.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aeef5eda9---28219358131.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/nobikuser.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/94672399773.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f56830b2216d53e6636ed64498ac5a5f/84594831735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=one+two+three+children%27s+rhymePDF 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_off0000c1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D3 10732 bytes
SHA-256: e2ad19cb1dd56b3759ef8c4da6e7775dd9e763548d52c1c79cfe3f24bc02bfff
font_01_sfnt_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 16376 bytes
SHA-256: f9fdaf7ecdb35b5bcc5f5d4500e9ba1f8c0b5e07b0112fadc7725cb0865ed27d
font_02_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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