Malicious PDF — malware analysis report

Static analysis result for SHA-256 047b7ce176dfcdfe…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 01:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0aac590a8706f40100bc3b7ef4d8be01 SHA-1: d67414f4ca69958de7b925ceac20f65bc805ca4e SHA-256: 047b7ce176dfcdfec54dce9d7030c4c1a5b36f83dd4f03d2fd2c33ae088d1982
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised websites and disposable domains. While no scripts were extracted, the structure and URL patterns suggest it is designed to lure users to external sites, potentially for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vssteel1999.com/ckeditor/userfiles/files/pidadotowezifu.pdf In PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/1187fe7dac35f2f8641b042f691d4dd3/nugujixejadagor.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b96bba588f---duzebo.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/jagimaf.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/witiwomifabonuwix.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/78911676336.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c562736b9b7d540aa582c8b31821c0d4/74718656176.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/xojuxupanutuvidewudaneku.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/19798384785.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/netawarujifavovutonena.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/rudenekalano.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/53032795590.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/paxinenojigebudipejexab.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/56778049142.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/88398419493.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/14838793383.pdfIn PDF document text
    • https://baglab.pl/galeria/file/rawoxizureliwupokutumekik.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/pakawurosu.pdfIn PDF document text
    • http://epmachine.ru/d/files/faxigimukopilowirutavotul.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/60007d92539ee006f40e8a7626d72e46/94120326274.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/47140747861.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1b3119c4b7a34b1fd2836faaeda80d31/174623265.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/004fe1a9fb0e5daebd913af8ce9b862d/sopuwuwoxutetububulide.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/69775941053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rudely+meaning+in+teluguPDF 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_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 10464 bytes
SHA-256: 8ee6b88939900c01afc2587371d201109ea6eb9f9a8c295f90f7cc342c210af4
font_01_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 21256 bytes
SHA-256: d2223c2e05bad730394b70917e87c90cf82b3dfa57b33dc19fe8c46f0ed8963a
font_02_sfnt_off00013f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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