Malicious PDF — malware analysis report

Static analysis result for SHA-256 2742433aa4be7c23…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 06:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53f33737ed0b51772423fb418c9d4da6 SHA-1: 5ac6e236b800fc224cb60cf4aca9010cd8589165 SHA-256: 2742433aa4be7c23bc85d35b26816b2ab779e2c5c7e12901502cb8de0b699b82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://cungcapbaoduongcuanhatban.com/upload/files/38742015116.pdf In PDF document text
    • https://b2cexpressdemo.com/userfiles/file/60623158926.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/60371566144.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/57113691580.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/295e9695dde6228152d3634ebf90750b/30122894744.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/sonirunew.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/38815203803.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/nuwibaduvijexesataba.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/68389998169.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a04a0f86e21c597596b04ae26ef90739/sifozawikeka.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/rupikenupuw.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/pivelo.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/57318922584.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832110f027---67841308418.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/40486192657.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/xoroworomubizuzolafo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/tq110neh97mqv1kf0uesds9b76/34007274555.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca75d8e6b---94192565031.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/95417880867.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3dba98709f9be61ef0c157cb2c526fb9/74938169278.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/90308770999.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/11274422320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pointer+and+array+in+c%2B%2B+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_off0000bfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB0 10512 bytes
SHA-256: a9ab0cc997eb6238d0e7be49d5412781254c66bc67cc446eb42f9a411d1482ea
font_01_sfnt_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 17128 bytes
SHA-256: 655eac983736d0b92cda8165f6945ef1e4c705ed1847f5cf4697dcf6514b5073
font_02_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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