Malicious PDF — malware analysis report

Static analysis result for SHA-256 b790beed653989b1…

MALICIOUS

PDF

86.4 KB Created: 2021-07-21 22:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0205c1383fe91bf402576ad0f1427ebd SHA-1: bb20815f84f08c36c0f6ee00d9122fc23f6a0588 SHA-256: b790beed653989b150093236753e1095606fb831afb73144f2ae36a4516f8dd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a redirector to malicious content. The PDF structure itself does not contain readable text, but the presence of numerous external links and the compromised hosting indicate a phishing or malware distribution attempt.

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 http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b73bb2896---xusodonerenaduzaxokupit.pdf In PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/bowazosebigapulu.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/16889861924.pdfIn PDF document text
    • http://e-hane.com/files/72943329579.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/jekelezax.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9ae3a077---68692926643.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085baaf39f11---kexedigejabez.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/19688018612.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160941d48c2aa8---rogata.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/morovoru.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/bojasufaz.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/10b6aad0e99246a975adbeb5d3153611/sinulefifes.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/silakiwolop.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/65989370653.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/0c2eeb91fee501109611c80adf36b96e/nubupupefuriz.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8f7eef81---91698431363.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/faxaposav.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/21100384767.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a150f09b1d---33006065980.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/9194975548.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/qgo6h2116l9lo4cd4cvetcjmks/94888639854.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16249962955721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=genetic+code+table+with+amino+acidsPDF 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_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 16908 bytes
SHA-256: 43f88eae4d8a6da3fd8f8c7ac7223d054abeda0467ae2db801b0d60e022c8f92
font_01_sfnt_off00011ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADE 10800 bytes
SHA-256: cba45d40b2cdb61fefbe323f4383af3d3b97d53ec0aac135b8b9fb0b4902ed7b
font_02_sfnt_off000133a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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