Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a8a23c50b7e15a…

MALICIOUS

PDF

89.3 KB Created: 2021-09-03 22:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a7e0aefd3344e9ec539396bf5b9dcb8 SHA-1: 1e428bdbd01ad5256a9bdbcfedba7d328ac7ab3b SHA-256: f4a8a23c50b7e15ae8b3dd84ab973cf7d2781761ad07c48f8d6784c04edd41c4
164 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised CMS uploads, directing users to potentially malicious PDFs. The presence of numerous external URIs, many on disposable or compromised hosting, supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0f3b12013e422a47efcc4c69d12d7260/lemilemamupi.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65977923f5---waligujeluleluxoxipexofu.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/sikoluzitiwak.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/40425401108.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f554cbe329f---jifagifotevomafalidipovid.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaad8996f1---pirun.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26672448026.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/kenaditavev.pdfIn PDF document text
    • http://surtek.biz/image/files/20150207_062022.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/550ea053eaf5591ca98f57cfe9f336e3/kifelimigivavavoji.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/13e056fc35f55f37c37e0e21948b428c/wowodam.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/84d97dab687d6b68ab9daf275de1ad89/kesafewijezejubi.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/44998413362.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/87add5066c45bdb0da2e9d54b3ff2e0b/54313125418.pdfIn PDF document text
    • http://contelex.it/userfiles/files/14349168043.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/darokiselipozep.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160893e2f5e71a---35735019916.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/sopefunuruzamededeje.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e2a03cc00---guvakonamibalejowize.pdfIn PDF document text
    • http://accronline.com/userfiles/file/47871519745.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/dutekasigip.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/30ccec939af45c5ff8f89d1c03ee4de9/84010269749.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/sisisewawuxafumiveti.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09c264728b---wotorotozazom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=suction+machine+parts+and+function+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_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 11016 bytes
SHA-256: f930ced7ac336510d8d34ba6284ac7f4ed29faa53a01a3c2e1aa556214496238
font_01_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 18028 bytes
SHA-256: db86a97e85da8232cdd709273c633517c664c0b090257000e87d44e41a14283a
font_02_sfnt_off00013f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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