Malicious PDF — malware analysis report

Static analysis result for SHA-256 6918d39858e65100…

MALICIOUS

PDF

77.9 KB Created: 2021-08-08 14:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8ae240960d3b43ca1ceacd85944a9d4 SHA-1: f7094a6551d39d76a6018af148503b035ff7e387 SHA-256: 6918d39858e651007bb7e55977f0c375184a4bc8b68b0dba143908b7cce6bc82
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The document body was unreadable, but the presence of numerous external links and the overall structure strongly suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9623

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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609676a3a44e8---wokomuniperimunedowoxuse.pdf In PDF document text
    • http://karpatskiles.ru/store/files/vatilesexekozef.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/63495912473.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/lukavodasip.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/96015896480.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/gafimakajilijazamasi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19ca567970---34590330.pdfIn PDF document text
    • http://abpaluso.com/upload/file/83195286000.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/90451001469.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///jadibejoni.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-24/20210724031019599942.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/44624846434.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/fedomumawafulujaxotivuzi.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/69099868636.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/nekopaxub.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/vifiwakanenalogisesasa.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8834dd6003c9953b7e97bb8bd8f172ae/23644923727.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/04bded1924fb9e0dc2d81dcfb5b72eb1/36061345362.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/49ff03079388ab380a6776f5d8f18126/1085045130.pdfIn PDF document text
    • http://simonide.org/userfiles/file/70703816331.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/30251929395.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a16131d21e5---satezifomafadiwetima.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/62466334662.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/66977781840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=phrasal+verbs+meaning+in+urdu+pdfPDF 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_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 17052 bytes
SHA-256: 14848be10306168e2db3be6fc55de644439a96c01c299217efa23e3326808051