Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf4daf1700d314c…

MALICIOUS

PDF

87.0 KB Created: 2021-08-04 17:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71db2347df3c5879fd5e07888c720006 SHA-1: 7d520f80a1ced3e42a4fa52fc39907dad8be9b0f SHA-256: 3cf4daf1700d314c7a5d5a93ed9125229f05bfbc9885e271c59eb3fce46986f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=how+to+get+free+jazz+internet
    • http://probeg2000.ru/files/userfiles/files/60245059549.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba9e1218c---totezojodebezogupu.pdf
    • http://clarksville.net/wysiwygfiles/file/32876709330.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/kavin.pdf
    • http://security-m.jp/tool/images/file/lijijigakegamiwewa.pdf
    • https://ktmcollege.org/public_html/userfiles/file/5023556531.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb7fcfb62---82723908294.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/55e5ca1e5dddd2be7c22a140f2dcc800/50526355712.pdf
    • http://www.sas.edu.mn/ckfinder/userfiles/files/tomudenezipa.pdf
    • http://mcutech.net/files/vapesupofujuvuz.pdf
    • https://totounited.com/contents//files/fakepakabu.pdf
    • http://jonkmp.nl/img/cms/file/vepinusim.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/569b4d927eb1a414d0c304f677c192b2/valusuxoxu.pdf
    • http://aivieksteslaivas.lv/userfiles/file/rivawimovupon.pdf
    • https://emprenderem.cl/files/zovodefuzijifi.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcd1e31138---2361411776.pdf
    • https://rumputhijau.com/contents//files/52399306478.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b27abcf80---fomerugomaxu.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ac090136---33455436783.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aebc96a867---narubulivatetate.pdf
    • http://nemdanangpho.com/uploads/2021-08-04/images/files/gigipugozi.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cdeb34f47565c8e529659f3e0a3d0da3/74523238971.pdf
    • https://bititechnika.com/uploads/file/73243974924.pdf
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/wanumijawarimuxevuworevo.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dda4053c60---tamemomopuxikazabufujem.pdf
    • http://fonnepal.org/userfiles/file/ditaxi.pdf
    • 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_off0000f1fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 16792 bytes
font_01_sfnt_off00010a10.bin
40151db0a79fb3aabc4decba925b0d34fc7a21e2d157e05dbb6f4f3171753dd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 16380 bytes
font_02_sfnt_off00013494.bin
30b2d924915a74a70324432b053e0d8a8ad7b86dd5088e3668c169806b6f10ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x13494 10440 bytes