Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed28c7d2395b8fe1…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 03:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e6de590516915ec4dd50bc26cc86f36 SHA-1: 547a97cb4f488ead8c0f47325ae48c4594e2a904 SHA-256: ed28c7d2395b8fe1d204bf7e8977ae4cd20d4a74b81e7cd2c49bf2fce07cfae2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf5081a23f---50422383289.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132532a0bc5a---kizejuwamo.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/45966304800.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/79063774902.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/karekuvoleroleruzufazuse.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/93568822490.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b11c77e31c---70168331069.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/1abbe1de84b07ec001a2ab7e102fc09d/32296708019.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zeteronad.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/xuzif.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/51542653205.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/dko7pvpm5gova24kv778uadkeh/4521330626.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/57860072726.pdfIn PDF document text
    • https://alpinashop.bg/files/44063285393.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/76807144500.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/panosum.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/48934009843.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/44867517003.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/lobupofulenimuduw.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/2499675511.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210912/files/20210912040218.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/waborelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+san+andreas+ppsspp+iso+file+download+for+androidPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1578648dda3ab97277a5e1589f4a98fb/raburoxufu.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_off0000c2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 16244 bytes
SHA-256: 30d2b63dcaf831c9f75881d422e6e84d39f21c89b05289fdecde39df34cf8d04
font_02_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 10616 bytes
SHA-256: 4b097eaf37b67365d9bb437506f405d92043c872c41c0118dbf8b9d64fd95db2

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