Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6527f4264bacd44…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 10:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7d494756bb1b827d14486b8433e4389d SHA-1: 92fd8c0646ca0cb69b9d2da80f68822309c730c9 SHA-256: f6527f4264bacd448472b9645e3ab3d31a0c3abdee92bfaa6a492c87895924c1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable or compromised hosting reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7fd55a828---wesutojota.pdf In PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/gowogegifuzam.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/zusajedasawuzusiwiwon.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/92691760018.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/51881570549.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/89098299621.pdfIn PDF document text
    • http://secretinvitation.net/images/files/47472262935.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/zefaralolodimabixexexak.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/dujepikalijukit.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/91421305760.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/vubowu.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109270114479371.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///56362478761.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354f3faf85a---49081386497.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/lorixanoxupi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7iej30t60ngi5q5hktmqsgnpap/91849861284.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/30207370323.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/tapulalexiwujovuvupaju.pdfIn PDF document text
    • https://ismart99.net/upload/files/47935747636.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210911050906.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16143619612836---lawenizi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d2f023447305a74d9ac35098ef063d1e/62734270691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+justice+league+snyder+cut+leakedPDF 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_off0000aeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C9 11068 bytes
SHA-256: b11dcb713d9a9953bae15ef35b8b9932795b29ac8f843f800bd1facc7e5d823f
font_02_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 17184 bytes
SHA-256: 4b46473c13881c2c636491115ada89dc568953e34d36cfabd68bbf0318bd0a9f