Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e050fc481ba7f24…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 03:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a78a6ac8ee6b10c5badb10a1a258e31 SHA-1: ee290310322037b3a2087355e530b7e026dbaea8 SHA-256: 2e050fc481ba7f24b0aa9239f0ca7d4e594ce09b45df999e18417d7c9e16aa05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of embedded JavaScript (T1059.007) strongly suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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 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://laborke.ru/uplcv?utm_term=the+conjuring+2+filmywap PDF link annotation
    • http://neza.cz/UserFiles/File/88792779693.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/sididufokobop.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/49536884485.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cdcd5ae20813dbf0df51eeda21554036/jazejewaxalagikeli.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/buzejulotazisufumibaka.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/6398582489.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/40484429087.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/sogewevepufa.pdfIn PDF document text
    • http://isvpro.com/custom/files/72397170517.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/17388012261.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631974485.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/56724015848.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109011624102038.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16146555a2746d---67159582946.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/44536381639.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/ramulogogivoxiresupuwuw.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/445e7d43d74d2917f836e94c161d558c/55342984099.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df44c91f33---95494764318.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/xuritixidodufalaj.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/98885280798.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/b6b936083686fb3f0c04c31f0b7dd3f2/buxoke.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/14242380510.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/50020429473.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/61699296830.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090204035537.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/38983530478.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 18860 bytes
SHA-256: a7fbdd75121610182a7650f6a849821279868bdd6d550bb25152f0eae368045a
font_02_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 11172 bytes
SHA-256: 460729f1307ce8b198f1fa506cfe1ad2a2d9483ed5ad4301fffb75d6c628f1d8

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