Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c84b21fb1a990a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-01 07:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbc691e4b39fcdca4ef14a6791d83525 SHA-1: e79670188d04cc8ad2f7529da5cfb906e981c2f2 SHA-256: 88c84b21fb1a990a9fb38d1e4f5dde9651470275affe5d21e3249a20df180fce
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload directories. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081e82a11f58---58742864792.pdf In PDF document text
    • https://fallsplat.se/file/39075027999.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/ruzuzovibeki.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/jodibilasebipufavas.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///pudopeku.pdfIn PDF document text
    • http://movediary.com/userfiles/file/gizopez.pdfIn PDF document text
    • https://bursac.net/userfiles/file/7954105775.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/77951696410.pdfIn PDF document text
    • https://cristalensi.com/public/File/97128929786.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16114001d616d2---49502960183.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/felixege.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/86974753127.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f167d794b7d10d3d01efd7a88927fc60/96002710213.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/csidcsnbul6bb043lutp4nvkl3/68472402578.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/98798426687.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6fabb284964a26397a14fbe1aad28c20/kokurubowike.pdfIn PDF document text
    • http://sksound.com/userfiles/file/fedanelebuzivutasifiji.pdfIn PDF document text
    • https://viettrungson.com/media/Files/loxedubimiligusijaragi.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/lajudavuron.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/doe9c3gsgq7ijc81gkso5oesk6/vemiravegimazapero.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/fdc555a3468eb999e522b47fdf8fc2eb/jasoxopobufariga.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d5e96a44b---47950660004.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/kobimujaniforekawoja.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083191590935---59267254841.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab241068635---37194435149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=does+blood+stain+leatherPDF 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_off0000b632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB632 16656 bytes
SHA-256: c500b8646ed160e93b4202339ce158ed9c386416eb47e9ac6a33589698661306
font_01_sfnt_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 10484 bytes
SHA-256: 05550cc017782aec0ae102a606ea59ac21644359e60c477c7fc3b02d270a278a

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