Malicious PDF — malware analysis report

Static analysis result for SHA-256 937e3f70397a7e71…

MALICIOUS

PDF

69.6 KB Created: 2021-09-05 11:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1279bbef294ed0447dea9eaf6a7074c8 SHA-1: 223ed3998b64a8418ecf5c1b0b8439e9db0403fa SHA-256: 937e3f70397a7e71d11e8fc26cc33c67c59338215cc40e332fb207e33776f30a
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 executing malicious code. It also features a link farm pointing to various domains, some of which are associated with compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://mtecommerce.it/public/news/file/63600393312.pdf In PDF document text
    • https://room12shio4.com/contents//files/12757551131.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/delagevuzatulesu.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/jesawivo.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/xukekopukezibil.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c4738c67c---94976739352.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/tejike.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/47115062601.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02baa0bd66---21672914161.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/kasivafofafukivegatidag.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/tunudisodorew.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1385a5a9c---21903282083.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f00cb493304cd9946c97e440fa6bec8f/fuvilebawiwomirilisezev.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/60636729355.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/743352216.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/limapokanumepabefudu.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/16678068565.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/guxufejuxevike.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/zubewewamutanisofomotan.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/bakuminuraxug.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff277893fd---65995815980.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/dubokafinav.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b4cfe9cb6f9f1da06088aacfb8992bfa/pekejozuwilapuve.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/53511685416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=esclerosis+multiple+pdf+sintomasPDF 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_off0000b341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB341 14484 bytes
SHA-256: d54125f34275e38a953369b0ec167559382420c1d6e58cb62152991b886e9f19
font_01_sfnt_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 10864 bytes
SHA-256: 33c6a63758951182f9cb7b7a55d3f146512da290a791723f2a7bf8eef5dc7b18