Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bf61c644cd5556…

MALICIOUS

PDF

102.7 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: 7943a39c87c10db01abb368e9bf33efc SHA-1: d0f918fd50096e670155bb17a15e40eedc696049 SHA-256: b9bf61c644cd5556858de7ea1abdd06bbbc409cb40ef27c6c52c11dc9a0b4fb7
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier clean score 0.2108

Heuristics 5

  • 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
  • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

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

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