Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6542d28e2425ed…

MALICIOUS

PDF

85.4 KB Created: 2021-08-13 01:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 703c735ed42dc81fa9c1020e6048f9dc SHA-1: 4115a9f7b43de9c3a1e9925f44506c21d6067164 SHA-256: bf6542d28e2425ed6a59401fc83957b743cf5870272973b5074ba591d6926d1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it is part of a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious files or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://actor-conseil.com/files/file/vunimun.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dd9ee73e---pugopasul.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d8aa9ffe6---48193892697.pdfIn PDF document text
    • http://sakem.org/userfiles/files/77877886255.pdfIn PDF document text
    • https://fotinepmuveszeti.hu/kovagoors/uploads/files/72215477174.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/kulidazotulek.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160847fa1ac338---92863039996.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/mowiwij.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/917e9d880582efad6621d4a4e8f09798/51371397989.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f261fde836---nufojavazexaretoxaropen.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/gexobakegoxokegelene.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/dasuloniwu.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/87026788387.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/zijofaxoponabolejoji.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/3e1e8f6e27d3d52c50355f3a24a02cb1/gosizipulogifanoxaja.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/57368788093.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cc3f5c9d3---jitifexukelaxoseles.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/39185712961.pdfIn PDF document text
    • http://termocity.by/pics/files/muwakavuxiw.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d27a4ea7ec---85267254239.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/33125915aedd95d5477f28433c298b22/87809052937.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/89238272719.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/29146527260.pdfIn PDF document text
    • http://rcvizovice.cz/ckfinder/userfiles/files/15757061092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+manufacturing+process+and+its+typesPDF 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_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 11228 bytes
SHA-256: 6e5f698f5cc56c5923cf051184127abbeb3041c5f0796ee4f651df3872e0eb68
font_01_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 17776 bytes
SHA-256: 080a1baa8b168f8f863dec28795666b635f3bdb6e27cfa661af2c9476f165763
font_02_sfnt_off00012f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1