Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba94c1f4ba12f7d7…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 06:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d63566a9e9401f517a613b84bb9c78ad SHA-1: d515345ba0940bcb43cbe5da12b98fe1e695a471 SHA-256: ba94c1f4ba12f7d79e6ceb6cc35e71f4594596b070af90a21b00c6bf87ab8e0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, further supports the malicious intent of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://producto.works/userfiles/file/rigaralobedixutinar.pdf In PDF document text
    • http://royalgroup.at/tmp/31994916595.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/fawupopovetiguwo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d6dbd974ac5ddcb5dc077aa9128f971b/mikojosupipaviseniwejidog.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/duwudiwor.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/38207856882.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109200953449437.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210925004521.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sejejiwenezu.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906222825.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422b970a38---jutoporufejobatejir.pdfIn PDF document text
    • http://www.centralperdana.com/file/lunuperokuvof.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161475ceabf8bc---mawub.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/39136173422.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/53303244759.pdfIn PDF document text
    • https://jensbrode.de/files/file/patodox.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210912_051f7.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/9042434594.pdfIn PDF document text
    • http://husplaza.hu/editor_up/76111158360.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa2e373d5---88582896308.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/78959029271.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/6882236623.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/nujupenixakujuz.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/20411437019.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109021756438515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+fall+of+the+house+of+usher+full+text+pdfPDF 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_off0000b309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB309 15500 bytes
SHA-256: b77e5c78b23e43f0956d423c82b91947fda52d53d17e19a3ea2cee5312b4082f
font_01_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 10564 bytes
SHA-256: 42ae79883f75ad45d57bf34526459615152335266a06ff4ad87126d9ee4c9a47
font_02_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1