Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b98e69395919034…

MALICIOUS

PDF

82.5 KB Created: 2021-07-22 20:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03ac1013ffc1f2c59890d22fd1bbb5b8 SHA-1: d55bdb17433d9bfd33e67c190c5498f73e52d4ad SHA-256: 7b98e69395919034a4e81d79f9e7f275bb09558bb408b9bcc2a66c950df392ed
212 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to external URLs, many hosted on compromised CMS platforms or disposable domains, suggests it is designed to redirect users to malicious sites or download further payloads. The primary attack vector appears to be a malicious attachment delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://marinapogon.pl/upload/file/beponagepolef.pdf
    • https://zionapostolicministries.org/uploads/file/suvajulumunowubitop.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd787615a5---62253637928.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gva2i9q8a37plgrj5njk2bb6s5/17061478351.pdf
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/tofafube.pdf
    • http://modra-skola.cz/userfiles/file/mijabutoborilote.pdf
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ditexogotage.pdf
    • http://a-mega.ua/images/uploads/file/36879369810.pdf
    • https://tyko.pl/userfiles/file/30371532045.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1516c5ae70b130e0a9e844419b954b17/22930530032.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d133a365---35931810454.pdf
    • http://inarchengineering.it/userfiles/files/vubimezuvifaneje.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf7d129af9---fumifofoxeza.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e28073296b6---vepidolibifikukefaremawu.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0qrmc9ns4v3bo4t9g16cbhvvp1/gisofiro.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81d18daf9---momowagirofuwun.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a63e6beae---lizegewenoko.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/55lr0pj1c7i9grdidrrkv15n49/35818454332.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0d1b49ae---86045073575.pdf
    • http://sincaremedicaltour.com/js/upload/54228252362.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/46303489e7d9a42d39786e612546367c/42603366245.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac6273a23d4a8fec4429cfa56cd1a162/kopule.pdf
    • https://thuaphatlaihanoi.net/uploads/files/98788876272.pdf
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/jekosekijarab.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7e93f22fd---26678112233.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+paint+in+ark+survival
    • 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_off0000def8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 16792 bytes
font_01_sfnt_off0000f70f.bin
bec0b2fc05710731b377ca88992c4fe831f696d0a1428d1b6ddef4fbedd1f7dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 10748 bytes
font_02_sfnt_off00010fc0.bin
0a894d323a588aca537aa789da59d9a1331585a5b7c88d52ec14ec2419ab6563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 16728 bytes

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