Malicious PDF — malware analysis report

Static analysis result for SHA-256 1938af9cca0038cb…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 06:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5672935c68efa9fab3a747ee6c466a9d SHA-1: 78569bdcd5b43753b5f0257babaff21cf4d6f80b SHA-256: 1938af9cca0038cba6003cfe11f05322b85acff844d4dddb4fd47719a964bef6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://kiddeefire.com/media/userfiles/files/lidugulinimokofavimipadu.pdf In PDF document text
    • https://confetti-seasons.ru/upload/files/xobovasorezote.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/xavaxivafaxozevunufox.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/1914313203.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/41439096938.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/volokupanejejomonedis.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/46886460483.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610d44c11524e---latexiduvovejebitibexaxiw.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/77798284809.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/acaa43dd56634f187cad5bc64ce0a2ad/foxagomoza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689897b206---fusofebipazukapimatevira.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/gasovamoxazufonuwotu.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081430052b49---boxorububufurugoke.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/davalevopi.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/golukiwof.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/ritame.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/silafopemekukowel.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/rijuwow.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098034ea347d---14816718130.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/nhss7topkgogqqmchvcet67ir5/sovopejolagidekipesuzun.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adebb71b08b---vujupurusijefigabumada.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/wusumaxoparojozafolox.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916d4802136---5958592506.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bfe194d15069cf15ccd9571b55b7f151/17600882124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dungeons+and+dragons+underdark+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_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 20092 bytes
SHA-256: 69c6838735ad4fcb6d6fa7c4ec4ded306021436d7450b9037748ac04243ea15e
font_01_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 10628 bytes
SHA-256: dd8be13f5a2883d8d2bb6f15ba86bec0def72dc6e493e39804b34fe385fe7e75
font_02_sfnt_off00013bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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