Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e52cf132ee6098…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 09:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 014cd0d10586ec640de329f2f36beede SHA-1: 4c32d0b33af03c37cee5ae2e97e5990bae188b55 SHA-256: 50e52cf132ee6098a761d7e37a97101359b9472396f42125bb4f967086981bf5
156 Risk Score

Malware Insights

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

The file is a PDF that functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs and the PDF structure suggest an attempt to lure users to external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/tolinowupizerumutozo.pdf In PDF document text
    • http://pazarziraat.com/userfiles/file/lazeverobopoxowoju.pdfIn PDF document text
    • http://meditopthailand.com/file/newoviropawog.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/68198956465.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/45266437571.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57a605848---finigivetugaruzozimen.pdfIn PDF document text
    • http://workontext.ru/media/file/27987846808.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/29189289016.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/41374546746.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/xinibudodubavixabovaku.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/kanoripuri.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109130352172380.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109031411551444.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ba7ee82---kowudaxixotiwal.pdfIn PDF document text
    • http://chamdure.com/DATA/files/lelerozitadunib.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/wanovafodatizodigus.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9b57dd5bee5a4466b6536c41d55e3cac/92608218235.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/75378571176.pdfIn PDF document text
    • http://congtyvima.com/images/Download/84876621657.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/1028737442.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/55003272678.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/xuvafuxetugiw.pdfIn PDF document text
    • http://drtamerturan.com/file/36331675999.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/58857677195.pdfIn PDF document text
    • https://lapakunited.com/contents/files/29355546203.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c3af2789---monusanaradifagelulam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cross+dj+download+appPDF 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_off0000ba5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5E 10308 bytes
SHA-256: a701a301e1e3f209b0d474d8a0466898f8e71115bedae0c08407e99a19587493
font_01_sfnt_off0000d1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BF 16464 bytes
SHA-256: 040555db0f1d74f0a565052c6d8d35ab25b5a12832b29f41c5b3b8fd4e25281f
font_02_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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