Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c6343cc2f2dcc9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 07:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb3bebe8a04a506b1add75416bf959c0 SHA-1: a1f8cb1a33f6992b001d36a250770837d9f6f6de SHA-256: b4c6343cc2f2dcc92aa48a4efd3fb1ee429aaed7ce2a04ad2bcbaead201729f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to manipulate search results or distribute malicious files. The embedded JavaScript likely facilitates the execution of further malicious actions or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d1c4d0c3---nugibevoko.pdf In PDF document text
    • http://phutungotodungha.com/img/files/39143841591.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/jebexesagutanimopibedel.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nukubopukenepekunefiba.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/37417603340.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/950763058c5e53476a945ef12dc0cc47/31643080622.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/91725715181.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///bilukelopejizesajazul.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/64156366944.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/mokonijobipidi.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/97331739381.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/wazap.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/1594288080.pdfIn PDF document text
    • http://labonscafe.com/userfiles/kinizak.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/tusosezuvipopozosud.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/runoruwaxa.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/696815849.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/27267152203.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/vavumoxita.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/84614174827.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/17992499634.pdfIn PDF document text
    • http://ssp.by/var/upload/zakaliwebizekesuz.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409723ca34c---vizikijakolezufafuvopok.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0755ae4b4ed58bd93b894e1357fcb26e/dolesunanutan.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/nezuzaregerinetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bloons+td+6+free+download+for+androidPDF 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_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 18088 bytes
SHA-256: 225acb9245bd71eacc3484d05be1c480d70ba6f7f617063828560efe1b38c4d4
font_01_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 10656 bytes
SHA-256: d4611e65db8ab4fbf9f507a70c83c4f6686d41b3b86ac16aaa1b6611ecb40dca
font_02_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1