Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f4b6213585a3ae…

MALICIOUS

PDF

165.5 KB Created: 2021-07-22 02:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbd6ff3a629aa07431fc46d1192d26e7 SHA-1: 7eebee8f2cdc6870d9d74f0d3631350ece872495 SHA-256: f5f4b6213585a3ae2c11d34fa09bb888e655645fe13986f6c05bad43120b54f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/021347831e7f3a6f286caf52076f35f1/85710254863.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/wajifero.pdf
    • http://cesishotel.lv/res/wysiwyg/file/62255342080.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2e8a0c8ca99711fb6e02665993b379be/98287723218.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/66446128535.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/46512622718.pdf
    • http://thevenetianmask.com/clients/71561/File/46039590375.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/gukigije.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/844b0dbffa486d6466e875b7885bc99a/zogolebogelovok.pdf
    • https://tndvn.com/js/ckfinder/userfiles/files/rokut.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/231cmt2lnu0829vvaegmmp11le/29203053835.pdf
    • http://pneusmarene.it/images/file/romiminit.pdf
    • https://wickedcheesy.com/images/file/fupab.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c5c1ba33---faginided.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a377b2c02---zisigekorebibatejeli.pdf
    • https://assistenza-termica.it/file/rebilofexelut.pdf
    • http://wsp.pl/userfiles/file/43805033330.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9b189c0e76504dcee8757f5c838a2369/4209013052.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e478053cd2893be83c11b14138b74e8f/36437621554.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be929c2a45---wiregevi.pdf
    • http://tw-sincere.com/upfiles/editor/files/mosupegujem.pdf
    • http://timeyear-v.com/userfiles/file/texusowegojutorijobowuj.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3575bad032317f4302b57ae5e5fbbe1e/1670083646.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fauna+of+mangrove+forest
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e4ea7e69e8d0bac2321eb3fd59b49e02/zoxazasuwikum.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00021d12.bin
b5d889f930e66eecf42daf388a94ae3b98945e16ed5ba76d837634d27e29854e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x21D12 17880 bytes
font_00_sfnt_off0001f76a.bin
e9a973b1debab62ce077931a776a210945b004718fc905027c658e7054d20414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F76A 10560 bytes
font_01_sfnt_off00020f88.bin
50396b532f74f04692c8414e652e1f05413962e0fb6b793e2432bddfa7787f0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20F88 3460 bytes
font_03_sfnt_off00023829.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23829 16792 bytes
font_04_sfnt_off0002503b.bin
ec069c9650b19cb56a09794f8cee4b26a01884c82761ad9fcc83f638b12a40f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2503B 21260 bytes

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