Malicious PDF — malware analysis report

Static analysis result for SHA-256 495821ffbeee8a9e…

MALICIOUS

PDF

91.4 KB Created: 2021-08-11 01:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cac66b7bcb25c0027a468f3b79876f37 SHA-1: 73f9f1a7671f1a3be71ca58f6942e648e9d27eef SHA-256: 495821ffbeee8a9ef7bad24ea6e0240a894aa18a79e9b48146bab497d97cb437
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to direct users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://imperfettoristorantino.it/file/1491246907.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fe366ad6b3c8974af6f9ad59ffc4bff0/gupuzetatetul.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5df13cd3db4a68b2465b0f822e49fa93/kovofonagokaloj.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/81720032024.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qis49ik6v4sda7ncnru14618f3/kanili.pdf
    • https://digireg.cz/upload/gegijotomolelefusofeka.pdf
    • http://auksozvynas.lt/userfiles/file/soduw.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/e6e238b03b7ac453954d37b9eb33032f/87493513835.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/9123e3dul8im5oc8o7pqom6pd4/655908545.pdf
    • http://hoteldazegliotorino.com/userfiles/files/jafewimevobutok.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/p53c1e2rm48s15hc8nmfvfuk9s/tutuduxewesafabivup.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0ab00230669db001fa46960be4eaae16/74338325827.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160971f9721aec---zuzikiza.pdf
    • http://kunas.lt/app/webroot/uploads/files/kedexuwezoluroga.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f32d50c84b63d27b0a5eeb345ed17e09/2482654823.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160813a0d006d0---xokakimajaluxer.pdf
    • http://playeasypiano.com/resources/fck_images/99511229082.pdf
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/miwetidujuto.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aee66036f59---fagewimagedodigabab.pdf
    • http://jiab.net/userData/board/file/mevudupumesor.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/k3ou48uglp2ko16nr01uh0t9im/vubidufuxurikitususivem.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/fe4865dc8d5c0a6476287f5b74de5258/96616358586.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xijemipus.pdf
    • https://plagij.at/ckfinder/userfiles/files/pafenus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+pick+stocks+warren+buffett
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 16792 bytes
font_01_sfnt_off000118df.bin
4a3c41711295afc6b6ed508b452e3a39285aadfc6e317f4f602236b3ee3a1aa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 10836 bytes
font_02_sfnt_off000131df.bin
ef2ec8d3e235997ce202d2313a60a916e2320a5f57f5f80d5b9fa8798aa9bcc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x131DF 17684 bytes