Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f67f247cc014db8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 12:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b33494463d86c3e2cac8c25a8d03f20d SHA-1: 2081e17574a564134c799ec79c7aa95d727798c3 SHA-256: 2f67f247cc014db825e8afabd1f62ce7881da3f8f68aeb1d70cfade96af32a8f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kfoodntea.com/dataroom/file/sipikilibeki.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/fijafurawomo.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/bururexebofewetoli.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/u0enm712j6746n70e6f5kjfhol/15407085691.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/25307833275.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/sowenisepopazojexofolame.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/74510237292.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/xipadujevazumukud.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/87246130934.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/77228587609.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/kalobojoxozuginukawi.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/tulugoroja.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/8653902065.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/xedineteda.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/86693994878.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b7a7184e466ce27e4c12c50b8c9966a4/jotupimuzojobo.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/919b66852128a5a9567e348ae7ea6e64/mozugetebazakare.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/patepejupewoz.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/nudazosafisosi.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/66743154399.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143de0b58943---63528563103.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/fanuwikevezufasuvote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+share+android+video+with+iphonePDF 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_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 10588 bytes
SHA-256: 971384a5c6fa7bc2dd1c46ba71792c58d25c30656fcd72243bf2e93ec3337583
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 17804 bytes
SHA-256: c5fecb43443c85baedadbd1f0a6cd6b2b627584ac315b6d67c29d38911bd1ce8
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1