Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8387c37cb770dc…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 20:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca25e77ecb2233aac03fe9032231e1fb SHA-1: 4a3c7dc272150cba9cc60fc4a98a28cd69c1989e SHA-256: 8e8387c37cb770dc8bf87ff328cf296f2c228b0eb2398ab3bd210420cae740a2
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple external URLs, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to external sites via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pcccmiennam.com/media/ftp/file/fogukijenuworapimuga.pdf In PDF document text
    • http://studiopedrazzini.eu/userfiles/files/1952327711.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd7e2b74e---22807383668.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/51376755254.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/xopulok.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/16656523954.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7532cade2---39811208026.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607706c56de28---wekopujimogasokege.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/53652298075.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0cf49f8156b3a7e84269ed40f610e225/bujokepajow.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d862f35d573---fotoliperuxerojobad.pdfIn PDF document text
    • https://eventaipei.com/upload/files/94947720278.pdfIn PDF document text
    • http://packturf.fr/files/xixavugunu.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/41521728923.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/ziwenil.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/16bc5a50540574c17e48abc899d79005/97541083622.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9998c2d15---30851768573.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/jaxifekomusunodez.pdfIn PDF document text
    • https://sambelteri.com/contents//files/88323917084.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/sawetizonamejixuseka.pdfIn PDF document text
    • https://seikai.jp/free_images/files/67357947887.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/08bf183bf97c7eb4b96c63d5d86d2ff6/69443347886.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/01f3f0ea020cc5fb9b26ae861c1a6fbf/61432167571.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/namabojexukotinoluva.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/v46at1kb4fbg5ghdsgk37esrv3/70305993552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lake+mariout+pdfPDF 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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 10488 bytes
SHA-256: aa063c024e847479d7f43f197a0d4ce2312e5ed6711fcf07e29b58481fcf2386
font_01_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 20260 bytes
SHA-256: acb7c82a914c38a9897392fd408b196b1eab5666cf6a44128d092d09b9894231
font_02_sfnt_off00012f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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