Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb79034defb59eb…

MALICIOUS

PDF

102.6 KB Created: 2021-09-18 03:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9b46ae9f0cf6257f9acbabeb34948c8 SHA-1: aed72ffdbe9388e746beebe13cc042e32b0ea5d2 SHA-256: ebb79034defb59eb324e4b86d92c1095819630204e44311e2b7938d477d3bd7a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate that these links are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=one+piece+manga+1+pdf
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/zorapexisirikasedimonitiw.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613797f3dcf94---13840133093.pdf
    • https://univerosg.com/ckfinder/userfiles/files/53607110663.pdf
    • https://vjlabor.pitscovn.com/uploads/Upload/files/devanepeto.pdf
    • http://studiobaldizzone.com/userfiles/files/pitosomabifolagazisotup.pdf
    • http://letsfinal.com/userfiles/file/pilabiguxovakavubufabagif.pdf
    • http://stroyvodservice.ru/upload/File/49062676454.pdf
    • http://bidadapatidar.com/userfiles/file/23289206020.pdf
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/dobuwubapovimelaxenuzog.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/64c313b7f040bc43518e72fa60e1cb83/tarefadinitabugusujop.pdf
    • http://only-svet.ru/upload/files/pirotiwosemezap.pdf
    • http://yoshitomo-kokubunji.com/jcfiles/file/felazeliratuzatukekoxek.pdf
    • https://mmtours.si/uploads/83039123715.pdf
    • https://yoimart.com/upload/file/20210907034822.pdf
    • http://stavclearing.ru/upload/files/31917001967.pdf
    • http://mweb.cz/images/file/90124218431.pdf
    • https://abss.pt/userfiles/file/79355986782.pdf
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/87008522439.pdf
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/93648495989.pdf
    • http://cheliabinsk.realxenon.ru/uploads/files/90648475547.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a25bd1621---61014469438.pdf
    • http://hflbdq.com/uploads/file/011233422355.pdf
    • http://arisutour.com/ckupload/files/kexilifew.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/52608702499.pdf
    • https://soudurelauziere.com/upload/editor/file/14241278528.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc7f.bin
cb83427253be486b5dc35224710cea1d2a27078ad6da64da340d8beb93dbb3aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 1964 bytes
font_01_sfnt_off00010593.bin
afabd556f668e5e81bd2035c8ecda246113db0c7b9fdd8bf2b5e09b388c12360
pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 25424 bytes
font_02_sfnt_off000146ac.bin
071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
pdf-font-stream PDF embedded font (sfnt) at offset 0x146AC 16132 bytes
font_03_sfnt_off00015c23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C23 16792 bytes
font_04_sfnt_off0001743a.bin
40532620cd85551f17bc69af47d959302dbc9fac381f9227ad3bdda53d3f7fa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1743A 10508 bytes