Malicious PDF — malware analysis report

Static analysis result for SHA-256 8818bccb9a09bc30…

MALICIOUS

PDF

78.4 KB Created: 2021-08-05 03:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1a5552b2a3cee01a7166a5d14bc21578 SHA-1: 7d8d0ca10d8ac95f6fb5b99375a4dea99fe46250 SHA-256: 8818bccb9a09bc30a96cd136b3a576bdd90173e45eb54b127b998e2a81a7063c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to lure users into downloading further malicious content or phishing for credentials. No scripts were extracted from this sample, but the PDF structure itself is designed to redirect users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=triptico+de+animales+en+peligro+de+extincion+del+peru PDF link annotation
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/39603588c258c5b5a434690c4ff67c9b/tewidupukikalunezexu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8854fcd408---29141376673.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/20a42795929bebf70d5317da5a00997d/gemetujomef.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e19b04b32---2999058925.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabeb31533---liloxibigapega.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/sanozesirisutogunuzazevu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d3e033bfcaa318fcf04e3cd4cd92b365/pubozopo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a173f79cccec85dda9c806027eb46ede/42370463456.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f20b12898b---vomogiwebil.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/16590771076.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/16974426038.pdfIn PDF document text
    • http://djpress.pl/Image/files/37220118681.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc8cc1b31---17646185610.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83a97ee29---rupebamisixifepogovawa.pdfIn PDF document text
    • https://kultmotor.hu/images/files/pawosutuvax.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3d2707890b654eac4283be000a68e0ed/juzumarud.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed740ec9828---wulajexanematodolerafop.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-18/20210718163532116097.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/91811978368.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/pibakixugojaxokusuwutu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57c5fa6466---28760244834.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f02d6713746---rizupufemifaf.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/golofuguwep.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_off0000cd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 17004 bytes
SHA-256: 3e18a9563cdb1bd430ea1c36783011731845ebdad37e254f52cc352e080b38a1
font_02_sfnt_off00011068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 11020 bytes
SHA-256: 0bb19e0910d7d7f2ab189fe8bc404a5b9e08d9dfe28d5190830ef350d660cb37

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