Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0488b5bef311256…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 15:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09fcc8019cb060c0b7a1fc442d6cc1f1 SHA-1: 3f87250b816c10a19691dc3f36aa450e5a03d66a SHA-256: b0488b5bef3112561161b4b98464106f9a6f061011f1f31b43b0f239c1aaf891
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://valencia.thepokeluau.com/uploads/files/59537043507.pdf In PDF document text
    • http://hykylalumni.org/userfiles/35218759548.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/686461303.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/wukedizofenonijoroduje.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/3321485489.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/81abc7c6bf39d995bd67769e3773ca1f/11471410166.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/24738247420.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/7221754040.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/lenoxubuwatagu.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/boveguziwoluzefavukefo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6a8ba525---nodosifowasetijosa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079267b1d240---31907608410.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/sokotaronemulasudor.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/15014475423.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/linajositede.pdfIn PDF document text
    • https://adikkedua.com/contents//files/40899543960.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/xogabobog.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c65c187fd5e---28769467955.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/duxugawoxi.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/gidaki.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/fowamusumegefaj.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e92812ac---nakubirazixali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=self+efficacy+scale+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_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 16652 bytes
SHA-256: 90d49ee15d4a6e90d197b6d91309219437de16f2e32f279bfcdace5b1ea80269
font_01_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 10380 bytes
SHA-256: 3fd0afd4fde53cf45c00dc957018f5358b5af09a58c471b6e593966bfa5fcc76
font_02_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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