Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b25d9814f6eb73f…

MALICIOUS

PDF

111.3 KB Created: 2021-09-13 19:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5653487c3024244ac43126955d1b7d7a SHA-1: e756bd36389c5b4bd6e7a900c210258747b9a1cf SHA-256: 5b25d9814f6eb73ff109e16a9e4b138725e994e6b6732f177cf0bb9b263e48ba
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://angelcabrera.com/FCKfiles/file/sanefijawagafopej.pdf In PDF document text
    • https://atvatextile.com/upload/ckfinder/files/duvomarikaw.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/1849341054.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/96665611164.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/luriwifasasive.pdfIn PDF document text
    • http://exosushi.com/uploads/files/vifemadufepupas.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/95288973924.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613931e0e18d7---25808598763.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/latewuralodepodeb.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/48219059624.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/3722519111.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613407077b1b3---16262241164.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/munafinanunikenelezu.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/vatuzepevatetatowulofigu.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/vomowuwejavogodolo.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/68326998996.pdfIn PDF document text
    • http://cloverdiamond.com/file/tiwunotozitunuguzozuzekuf.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/30081080614.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/87646066670.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/27845547121.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57e1af0e416ca9bfdd9095e11ded1e13/29302723209.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/vodutijefovunebabisime.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/bewitidego.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/14654345196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=react+native+logcatPDF 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_off00014bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF6 19896 bytes
SHA-256: d398285e8499d671b8d4a8537219a559cc7b25af2833f02641b1ce924e48e48b
font_01_sfnt_off00018058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18058 10248 bytes
SHA-256: 26781a9d442b891e2c40dda303b4819f6c2c04eb3f2d83f7b780db94def703f8
font_02_sfnt_off00019788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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