Malicious PDF — malware analysis report

Static analysis result for SHA-256 7150280279e9edac…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 06:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3003dc228b25eaea12a4f7c4c7ca4657 SHA-1: 4fa9ba1d38317328ee454113622c15b83378eb44 SHA-256: 7150280279e9edacf6138250c601c58845c05d87613b727e6e78db560766b631
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of embedded JavaScript further supports its role as a malicious document, likely used to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=best+dpi+for+redmi+note+8+pro PDF link annotation
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4c3b28b0---dexumumu.pdfIn PDF document text
    • http://carszana.com/image/upload/File/73583679301.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/jisex.pdfIn PDF document text
    • http://beiks.info/public/file/zojiwifumiferibexoni.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/32142912181.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/xixawalinu.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/23559758182.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/zevoxamewulepase.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/lavaxujaz.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/85943961851.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161379b463c789---44125691933.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/nivefigojixilorubir.pdfIn PDF document text
    • http://chemicalengineers.ie/images/gakadetidekakofifisevowu.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/lamaxajo.pdfIn PDF document text
    • http://mebco.ru/images/file/disuroxogo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/uu038oubos661n5k6oorii27v4/rejagukezibudekodizikowuj.pdfIn macro / runtime command snippet
    • http://fogathajtohirek.hu/fckfiles/file/nufoxiduwaj.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e6aae499b2435bdf75bcb6722e3774db/75028857842.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/wuninikedejajopewabigu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613334cbddbd0---5769775162.pdfIn PDF document text
    • http://saktigroup.in/uploads/21833578390.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/48206194206.pdfIn PDF document text
    • https://pecintajp.com/contents/files/25163243448.pdfIn PDF document text
    • http://soupworld.de/upload/file/gifafajikaze.pdfIn PDF document text
    • http://mebco.ru/images/filIn macro / runtime command snippet
    • 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_off0000cfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 20380 bytes
SHA-256: a48a5fe3a8a2afd62b7e3f3ea004cd3380734f417c63160b617ee991c1a754d7
font_02_sfnt_off00011ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 10712 bytes
SHA-256: 36ad48207e1ac82d1cf0d84dd10613a657d9d4afefd3690d6fdafb22e1a77561

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