Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a78d9ca8e1bb9d2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 16:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e47e6fba837dfb470a04bce60720d6a SHA-1: e9ba7c83ea6b1cfc35472911a7bee269d7af222f SHA-256: 5a78d9ca8e1bb9d27c32c3029f04ddc8b3efcde0c692eaf79e7a247452c15587
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/60361172058dd0a98a2b4243b3f3d908/fowusakonewigiwer.pdf In PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/kunototesusetivewulil.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/2p9nu1s8k7jnl32pv1j62i7mc7/tadibajedopigiwatimenuj.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/6105029885.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ec8054ecd---raveterowavofot.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/35485235123.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8231bec7---sokulolonisu.pdfIn PDF document text
    • https://yuss.it/file/mibonisavapibakilikunug.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/43524305655.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/49872661478.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/bexadipagulalov.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/1850606074.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/24112921457.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/75705647151.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/06d88d283259f695dc6b1e8cf648cccd/67859251783.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/puvakud.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/99ba5f5083d5b1faae9106d53f89f654/kelobutovesitu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9fafa12b9bba97a9f390b5766fd7a01f/68862325785.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/13184583157.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/guneniwuwesuralezosugol.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/20815478583.pdfIn PDF document text
    • https://rinducm1.com/contents//files/61071023354.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/79498161292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=aws+products+and+services+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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 17276 bytes
SHA-256: 715eba88ee59fcdf73aff9179c2b03ddecf4ad2b5b1ea0d8fa1b9de2673b11e6
font_02_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 10800 bytes
SHA-256: f12bd1b32b012fe63475ade0135efd7308d15b095a7bd65e1bff28817d8b3af7

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