Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53a4cdee27d8b9a…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 12:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 531e6c70121ea42971e21b45cf1a8d17 SHA-1: 95f732f2723aab1a49b1d35b9fde71e376415234 SHA-256: c53a4cdee27d8b9aefcdf666412850b1be8248355ab220be9d84d38593f11cf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing and trojan activity. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=car+drifting+games+for+android
    • https://glaze-metalart.com/upload/files/37065482308.pdf
    • http://lukinserv.hu/file/82614536338.pdf
    • http://kleinschadenexperte.com/userfiles/file/dupidurev.pdf
    • http://grandwatergatehotel.com/upfile_hotel/files/lelebuxemud.pdf
    • https://olterus.com/contents/files/12624436774.pdf
    • https://euronuts2009.ge/files/files/xeginowox.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/11f873ff9f7a88874eb346e0159f32ff/69201401722.pdf
    • https://bestofbucerias.com/upload/file/mikipotaduni.pdf
    • https://regiefranchet.fr/userfiles/files/66846654294.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c689607df5---56699536019.pdf
    • http://chinasoftcore.com/userfiles/file///91938002880.pdf
    • https://underworldgear.com/admin/images/fckImg/file/jaxevidosesupe.pdf
    • http://simonkuehner.de/gfx/userfiles/files/77818310468.pdf
    • http://lexxyin.net/files/fckeditor/file/burerutokezopatufujuk.pdf
    • https://tradegateindia.com/userfiles/file/28579961513.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ud8n833r5k2mn67id8c8gg5lt5/3611779330.pdf
    • https://creativitagh.com/pevron/www/img/file/kezunanu.pdf
    • http://uceng.net/_UploadFile/Images/file/rozeramad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABAB 16792 bytes
font_01_sfnt_off0000c3c2.bin
cffeb695e8dd2beb209e05586ab871dfcd1bd8da2a21b218a33fcde00332bd69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C2 10680 bytes
font_02_sfnt_off0000dc0b.bin
a61f6f2f9608ceefde5e14621faaead77c7af43085a3d1a1b0871600c1257be5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 16880 bytes

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