Malicious PDF — malware analysis report

Static analysis result for SHA-256 316873c8d0e47205…

MALICIOUS

PDF

76.9 KB Created: 2021-10-07 22:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8565f3b9be11b195ad9b5848905b330a SHA-1: b9183d67885c7c014a671ac1f1c43edce314e69d SHA-256: 316873c8d0e47205fe7c262bea85e5f99a3d446fdcd60828cf607d9e2c1e5786
164 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://managhantasala.net/mailuserfiles/file/fibukiroromotib.pdf In PDF document text
    • http://dietmoiquangle.com/webroot/img/files/batoguzebod.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/63666208177.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qpqc0k2isqedo2e39gnnsjb8m6/58987525816.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/568dc01edb8501d058622419346fef51/nonumivatolaf.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/mutokepemagojita.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/ladikibuz.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/54647422509.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/mumen.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f8f7d7c1f25e225ad86189f1a50d929a/93048934774.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/6100079156.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021928116399495.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/newadusokewezis.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ccaj8utslqrh5a4f6ofbea56lo/gegaj.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615ce4cf7d43c---35175263270.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/divig.pdfIn PDF document text
    • http://lj-group.cn/upload/files/fonexej.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/50014608778.pdfIn PDF document text
    • http://www.siposferenc.hu/html/84778013518.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c2fee4658e75781f53d6042db453e63/tilatikujilinep.pdfIn PDF document text
    • https://777mto.org/contents/files/62395879084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=drilling+oil+and+gas+wellsPDF 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_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 10412 bytes
SHA-256: 6f76131c367874902817f5c8405435026495146d259262e77f4c27c0118db992
font_02_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 18548 bytes
SHA-256: b3266be985bf46b264f799648dfb1c0e65cc9b326856b25e555ab4b66bcb6ee4