Malicious PDF — malware analysis report

Static analysis result for SHA-256 26082faec48d7b8b…

MALICIOUS

PDF

95.4 KB Created: 2021-07-24 20:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d87aca5a69514786cfc623522dc714f4 SHA-1: 5c1f00a5111e7bd7e833ed4eb558ddb1d63ad6c6 SHA-256: 26082faec48d7b8b0eaf5d7b36a439badc0a48c12f5deaf179f28df2b9ed7584
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are compromised WordPress sites, and others appear to be disposable hosting. The links are presented with a UTM parameter suggesting a lure for downloading Microsoft Office, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.
  • 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://proxima-design.cz/files/file/jufuneroko.pdf In PDF document text
    • http://pronobile.de/catalog/file/jivomefemilewaxomusivege.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ribowinukegi.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210716/file/16263721097063.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889e99d7335---25043702790.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/4639673043.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/sosilatigurilojariribi.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/628c44a1eb0ae6b479f26ba609e4a807/sitojafetopa.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5623a499---duduludatoguboxuxakenewos.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/lutukobekifiwevazut.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0d1100715---givobejalemixi.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/50cc6f6bd3027ab3bc2ba1f665ceba4b/26928638903.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/6631027693.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/32719931513.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/nexubuvulekafovuzogelur.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/43796336184.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/omgjhc4r2rj63gp83t4olkk7t1/16881427575.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6ac951a55---66671823069.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8aa7952b7---45471485096.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/90201831807.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/39323323086.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8260f68248---menojijinuzerupuputogaxug.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/junevigupaporinip.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc90117bca---werimilurofexumep.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/29iorraelipm1l1jlm3h6lb5h0/buterizotofakunan.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/7b3724b7871c29b30127177dc9bacfd1/xuvuvewuvevuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=descargar+e+instalar+microsoft+office+2019+gratis+para+windows+10PDF 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_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 18652 bytes
SHA-256: 73b44e8e2e13ad65c34139d4a3fe3e5831af3655c650ff37f351a8f1019c363e
font_01_sfnt_off0001390c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390C 11512 bytes
SHA-256: 12bc756ed79208469cd6d37f24e4bda0219a3572bd40ae83ef53317c6385ffb6
font_02_sfnt_off00015440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1