Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea97ed4746a8b33f…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 01:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 164424da0581d15073171d48e8370bbc SHA-1: 8e429ca5ecd59e6c89d32ef459e680ad89ee2597 SHA-256: ea97ed4746a8b33ff8b7d618ee267eada9bbc3071cb6227ae133b94aeccec969
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the link farm structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ondrejkocar.cz/img/file/degefej.pdf In PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/17803899327.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/26237012682.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e713301a76---44656294005.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/tedamatovibasoxamaroti.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hi89doo1d3osnb1qbjr7mssi44/36324103001.pdfIn PDF document text
    • http://arslanemlak.com/E/file/49254254585.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/73826636474.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdc1e6d28---xeberitafepetufitiludex.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7859922e---92161065640.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/94b8254a180cfdfd5b28fd0097208ab7/fapumowibavenimomowexale.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/13282173683.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/60802347724.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/nufozetopituz.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/08/13/45104889698.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/45604897324.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/lklpjfpe0r4469d5cp6ao2eqsj/pumojonusap.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/54394832317.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/vikegujorapaxojudoxew.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/42506896252.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/9218320000.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/bidujanarurofo.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/ruder.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/9e4e275a9179e28977137bac1be24643/fovejoluxutijevuxufokume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=applications+of+supramolecular+chemistry+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_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 19056 bytes
SHA-256: 5c8ab6b0deed4da31babd05e299c761cc2da8c3fe633f43cb383362ebbbc9bab
font_01_sfnt_off0000f8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 11080 bytes
SHA-256: 97733c8c5cc4d37d9e1061874d4140a6a3fa5a8533c846802fb92ff2ce8a54ce
font_02_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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