Malicious PDF — malware analysis report

Static analysis result for SHA-256 27531c814f73c7ae…

MALICIOUS

PDF

80.4 KB Created: 2021-07-26 10:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96000d766affa788af965e2b53306309 SHA-1: 2bfaa8d3c0656ad2a703b5f6c6f1d3edf5722ed0 SHA-256: 27531c814f73c7ae7a726694e36379b5f4c8523f922ef3e76a43d3a173aeec8b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs, which are then used to host further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9482

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.
  • 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
  • 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://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/46fnt2rarcp6iubs8l2mfe02u6/59799570729.pdf In PDF document text
    • http://thevelascofamily.com/clients/11614/File/88357695068.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/bosifevezijibamaxupi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e710f752e1---xixovofidujivib.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/lofubaba.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e1eee82f42472da5b4245431e7ce4063/zobexasefad.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/14168861096.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b62c7450c4fe243449bbe7c5239750ad/gariluwamobovamu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40aab1c5b---66813245585.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/92050109043.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/14700015654.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/56600565161.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072787aca5d1---85908507658.pdfIn PDF document text
    • http://wenxuezj.com/images/File/42789723645.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/lesuziga.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/dikebafosadevinon.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb648e7f046---tipinu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c9bf5264d---76587315454.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e9827cbbc512316d5c2ac8dace232ca5/pikunozomigowofo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/91ac46b9e25780b869d3b2b05619277f/vulewagemipufijubi.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/63344292632.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/b2385574f181fc3e694bb881350d903f/jovegonu.pdfIn PDF document text
    • https://fishboat.hr/files/nivomimesuwafopovidixiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=%C3%A1lgebra+y+trigonometr%C3%ADa+con+geometr%C3%ADa+anal%C3%ADtica+solucionario+13a+edici%C3%B3nPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 11492 bytes
SHA-256: 1e9d91668359ac22576276d7d85369acaa000f5bf42f6c311429de13ca9ae773