Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a73708059d45312…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 00:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e74938e1fd88b710bb57adc3b74210f SHA-1: 339d38d6bff9b16cd6f5a216702f873876828396 SHA-256: 5a73708059d4531230ebae4de208fe336d5977b252c688b86aef0500ac4d08e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://loaamtran.vn/files/usersfiles/files/93591737643.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b7825046e52d8e18e874c9149e224db1/padiwaduxefesujik.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613357e50eed1---zenud.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/vuxedonigitenotona.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/sdvkfsofav0knb4bhc0cmmd73q/giremaf.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/31736185108.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/81514244714.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/vogiwidu.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/luliwevuvufawidubejuwetiw.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/87871812201.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/bupofivegilebaborat.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/tavesoxetununegi.pdfIn PDF document text
    • http://net-marketing.hu/images/files/47539857097.pdfIn PDF document text
    • http://halanmilk.com/upload/files/kilowexopuwujevo.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/91546206194.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/6374275364.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614635abf0db8---67400909406.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/47527780360.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/gisifatofafumapidev.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/pamuvuzedelolosusane.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/87425411350.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/wozatexodovazazujigirobor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=decline+of+the+west+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22A 15908 bytes
SHA-256: b1de882614a636baae0d53274dfd991de6392b3641f42b4e92b370be8b661ef1
font_01_sfnt_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 10544 bytes
SHA-256: 59bc86b9db1fe11a71c5488568c58a40642da32c6b0a8b4978b2d807feaee7f2
font_03_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 17652 bytes
SHA-256: b664db26888257376820109443b9ac4c3fd7707d76bda19f4a9dac3dea6a3a9a

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