Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4582c36368daaea…

MALICIOUS

PDF

111.5 KB Created: 2021-09-04 06:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 72b6fef6323e1f10d9a9a3db2524ab9b SHA-1: 28b57964b2ae6a6b00e8f43862c6b833a2eaf644 SHA-256: a4582c36368daaead44ba4e4b3b949a55ba170b82be02cef61615538d9edeaee
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious destinations, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gruppocinofilomarsalese.com/userfiles/files/67353137233.pdf In PDF document text
    • https://aydin-elektrik.com/resimler/files/40688837092.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/dadipofikebi.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/kawigopusimugexuli.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c920ce790a6---rejobuw.pdfIn PDF document text
    • https://andana.us/files/files/75613681271.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/vagilavajo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecad51fee8---44950903142.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/t3aa17rnegjmul2u2qqq68f76t/famafazagulipalute.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6b7f952ca81602c45d69bba7f35e6f74/99904859020.pdfIn PDF document text
    • https://equimat-cheval.fr/file/92886643834.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e00207b7d2bbc777705812e36f6df65d/84270717206.pdfIn PDF document text
    • https://arerp.kr/data/file///19651214978.pdfIn PDF document text
    • https://alutat.com/data/file/xewutafixarobon.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a3be7639ca2f57d02fa7c5c07e36e39c/96517566793.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/9672824072.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/deveg.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/42968342690.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aaa9ca70d---43412640443.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/8497752308.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210813_034946.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5a4d0f1eb4fd5e5e9d12163439794e3d/89740867777.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/xeraduga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+terjemahan+kitab+minhajul+muslim+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_off0001485f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485F 20160 bytes
SHA-256: 9c9cd53f03b7094c58ce561a2f257c442ec7d51ffb23c92bc4181cab04d9475c
font_01_sfnt_off00017d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000195af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195AF 11312 bytes
SHA-256: d77a8fee8a4610566b07f1c62ad4d917cc74aae40f42000be895bca57d2648a3