Malicious PDF — malware analysis report

Static analysis result for SHA-256 6423bb48d5b81969…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 00:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 503237016dd121e1c49f9c371ffe06bf SHA-1: cab19c03cb5db172f567fcfc17515621915c07f4 SHA-256: 6423bb48d5b81969354096100a671911a8451becd8c146529c3c1063578411a6
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs strongly suggest an attempt to exploit users through malicious links, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=dobladora+de+tubo+manual+truper PDF link annotation
    • http://arohitourandtravels.com/userfiles/file/32332537603.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b9e6c319c1540af8c8ba7fb20599c4aa/22645727245.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5236a20efaac2488a87d4f79577aa653/73986622534.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/puwibevitatider.pdfIn PDF document text
    • https://paradigma.bg/uf/file/30377268042.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f61d641cfd5a7fa60e63db74bb6cffe5/febumawenokomox.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/48239902176.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/evpjge2h0598rdqosmvnc4c0p3/zewezubufotez.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2e3e0df0---25721468841.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/a93ef3e632b617911e49d586ff77f133/wilinidadabawofurulekuwam.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dcac14138abf94ed95cc6194e4d34b8f/puketepitawasuzabaru.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/41063210616.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/jiladaferizuwegewitapi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f88d70b7dc2---26510966328.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609df583986dd---5998790113.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d43edb9b792---14631770162.pdfIn PDF document text
    • https://bem-sa.com/img/file/2259120342.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/kegafise.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/30342967754.pdfIn PDF document text
    • http://preiss.at/upload_files/files/37345876411.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c0ee1fe4---38398426270.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/31389788329.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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 20076 bytes
SHA-256: 0a646d106ed4d505feef4b0f26aed875cc9e8466efdc71753aa045cb401b9179
font_01_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13167 10532 bytes
SHA-256: 82a3db842afdfd271131bb484c0dfb12a3dac1e7f8795f2b22a9a13de44770fb

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