Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b16d7f14e38bd45…

MALICIOUS

PDF

104.7 KB Created: 2021-09-01 00:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3887421cda1c2b63e17667a2813bcd8c SHA-1: efac4603326d29d43702c37264522372fdbb9208 SHA-256: 2b16d7f14e38bd45118292635f6d06cf39c0f4149e831205737d4faa4dfd78c2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL targets are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/l7e7m5d4s37lbqhdmeln4or6qf/linasaruke.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70fcd67f09---korepibub.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f9e975e3---kigenunibaxutetekidoja.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/89293991576.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/kadoxix.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/78004b678f4191481266f85c1f9839ee/bavapinatufolinetegejixob.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608648bb095aa---kukutebejosimepib.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/16936718822.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/83951251768.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/gonuxogiwepero.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/95498820881.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/rirutekixedomepikevupage.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/komeju.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/runesuvepupegezawozilaro.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/mubajimevub.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4eae5c1f7---numuwasezimedonisuvul.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/mivufig.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/bafomijunuxuditirap.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2b04240604317f696ecf2b9497ae086b/mulasoweximitivifazo.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/93066097214.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5ae271a4f---jolijo.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f2c825eb5daf31af7f486e656dbaccb7/riwuku.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zabezutipuvaluna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+look+into+phrasal+verbPDF 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_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 10928 bytes
SHA-256: 41ccdbb82da615f727aa6ce56c8e6b044f4ccaddd6591c5ef9bade63cc296adf
font_02_sfnt_off00013924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13924 16488 bytes
SHA-256: e9652e69aeb26926e8e1397c7f05b69b8cb684603bd40d09dc385a76b5d00b5e
font_03_sfnt_off00015025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15025 26400 bytes
SHA-256: ed4f6f8eaa72c7fe60ddec6b168a1041211616321ace750a227ad57538a5eb99

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