Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7f8f101aab5931…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 03:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60f42cb3ae5bece131dfd21228cbddbc SHA-1: 4eef43f0f826d25ed82640f14af41682da1f8c39 SHA-256: 5f7f8f101aab593195d8c2775889daa1f51fe68360dfa8635ddb77f554127287
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various domains, some of which appear to be compromised WordPress uploads or disposable hosting. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure suggests the PDF is designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://marblobathware.com/app/webroot/img/files/65699296996.pdf In PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/50679388521.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/66770334525.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fowevupoxemuzu.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/betumobufokamelirigorimuv.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d56695ace35d31e818edc5c45779a3f9/jidopufug.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16125099de39e9---poditefipifiz.pdfIn PDF document text
    • https://fallsplat.se/file/72159737943.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f39cb8751c---5882009773.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/26701670075.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078e62bdff4a---8915262300.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/voxamapefe.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/26999048158.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c8501cbe2ed---45597920763.pdfIn PDF document text
    • http://creationart.hu/files/file/98037174935.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c6acf49e---66617504750.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609b39d9968ee---topufasokizuzowuvifotix.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/41537591706.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/81549672920.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/75779537181.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sflgs7ptiafg83lfcf6delgknu/37552285390.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/rizaxokulusawumumisipeku.pdfIn PDF document text
    • http://zeci.nl/im/image/pasuwipawoterusolewikifum.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7f5c396c9ce6e71eca909f20da86d7db/vuropokobugomokedizi.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ca0073db4e9e12ab8e713b8eb8614a89/gefetomalepipobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kitten%27s+first+full+moon+worksheetPDF 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_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 10620 bytes
SHA-256: 92071c51e1f81b09c362c6d1b21f21c4521c697ae3c4cb9355fee326ff14ccc2
font_01_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 19216 bytes
SHA-256: 75ca7e9a713ec54087c55ae951ff73cf2f01a9e125aa28df3202939cdd22d510

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