Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec72927dd12f935f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 00:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0923df0d5ba00520ac482c73c1a63b82 SHA-1: b2d66cd1ba431d3a8a3db66556f5a823fa379b69 SHA-256: ec72927dd12f935fa5878f9d272ed4e6421913cca8d1c74afe4c317426e90f39
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which point to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests it is used to facilitate the redirection to malicious sites or potentially download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/edce3aed96169e0f570d4da7af3f0337.pdf In PDF document text
    • https://onlinendttraining.net/files/kubamivejofi.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/tuxozikimu.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/xupow.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4485cb46---64937653804.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/13109801364.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3ca606203cdb640f9297b8cfe47c3f20/jidawuxalovatibugugamer.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lugewifizep.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/zubusoperade.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f58021dd41---zamazixotapefubavaxawalij.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/17720946600.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613328a36552f---barerifirumedesa.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/goxijoliliva.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/sedotisadarakizurobe.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/31581196901.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/xosazosividedo.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/xijokuxulegivorutipi.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/tefurovawesiwa.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/3119680440.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/pudemi.pdfIn PDF document text
    • https://bawauang.com/contents/files/xoputukurupiwu.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/vakidusabadabaw.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/pagepof.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/dagewubiteni.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/lisoguwejobosomojinenov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=photo+movie+maker+app+downloadPDF 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_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 18516 bytes
SHA-256: e1836e0448511ec88eb862b10bd8d4fe6fa80159fb7952897d6908c01032b5e3
font_01_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 10736 bytes
SHA-256: 2942d425e9607c56ec8e927060587143170c0173601ef3ec16e5ec2bd1139df1
font_02_sfnt_off00012bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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