Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0f71b87db58450…

MALICIOUS

PDF

92.6 KB Created: 2021-06-27 13:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a7f7ef612df5d4d68f68924ad96a8b2 SHA-1: 6872b995bd64e96b06c9035cc20d99791380757a SHA-256: ae0f71b87db5845018fb7f3381f765d0e8595fd71c7d7c8548e1e4d93696ed72
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=best+friend+by+young+thug+mp3 PDF link annotation
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/2688e49b3d670b2f97aba2dc1b6bd4ea/94217685713.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80ebb93ee---bodepunanosas.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/2472e744c96df755cb84b1f64e8c6a9e/65714965926.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f5fb33d7b---bizimigidomazoragijuliseg.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/6582326403.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/okg1f8mj2pqlh236qd53han1gv/52346465484.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db44405c95---busug.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd696fddb---65375977110.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/67509295810.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f955fd4f0c0663b2e90ca5cb5876c341/kafezobigu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a054fd1d3ca1d03429cc76ebe4d394c1/19432198593.pdfIn PDF document text
    • http://medrea.ru/upload/files/wopobidirakamoneji.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d396b8fe0---85824044760.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075c716778af---xuselusuzaramepizokid.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0cf624a88---xisugububozed.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ae3aedc8dbc6b6aa2992aa9a45c19835/60736858849.pdfIn PDF document text
    • http://simonide.org/userfiles/file/xiretekaj.pdfIn PDF document text
    • https://energooptima.hu/upload/File/vomawow.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098792bdee8b---48533443621.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf40dddae---20716063938.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/72945193237.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d78e9c48e---danoganovofaki.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/5ff1bef195e40dc80dbaf218e74a3cda/zipotex.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/jadalubovepeso.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160924d8a653de---muxuvur.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 11316 bytes
SHA-256: f3fdd56ca346e41d1b7347f507b3db71c4e97cd54fa92d906edff0c80cc81a5d
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 18296 bytes
SHA-256: 5cb743d294b47532d102f452551de7f8c82ab72e825517e358890374a8f3b755
font_03_sfnt_off0001392f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392F 19248 bytes
SHA-256: a06abf5703c3e66f9811cf1348266a4b21483dd7eaba099756e5f529c6426cc9
font_04_sfnt_off000158b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B6 2652 bytes
SHA-256: 948d6d58cd2748c0fbf4d57bc9278ca17008975991a7ad1d7255ec442b11676a

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