Malicious PDF — malware analysis report

Static analysis result for SHA-256 5685e418f88e577b…

MALICIOUS

PDF

88.9 KB Created: 2021-09-06 07:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a0c9f139c9e99fb98eb34180378a195e SHA-1: 3ae029fd8cfaa7c0c20384f040c9c5ab05ddf96d SHA-256: 5685e418f88e577b9e65aa7aa9700a5fd4a3e47000753d06a4277786f62e18a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hodori247.com/uploads/files/55921434766.pdf In PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773bed33131---15751007461.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607816667c6a9---fubarapisedi.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/53095509895.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/selewiluv.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/65164835125.pdfIn PDF document text
    • http://ge-mak.com/files/37731357806.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/21346174515.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/67896489709.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/leluviledo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bde3426fa---tawijarej.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/dixuxijazawegedano.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/fizewuzuduna.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/mizakejogu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/27dbc13462bc3ce776e6558884b0c483/zigilutulude.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/9444053315.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/kigozumumu.pdfIn PDF document text
    • http://bakoca.hu/files/file/79355048815.pdfIn PDF document text
    • http://wohntraumgmbh.at/jezimuvo.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/joviguw.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754e10d30fa---fosepisarafulusalote.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/76526608649.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/refugufunetobekapenenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=taser+x2+manual+espa%C3%B1olPDF 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_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 10716 bytes
SHA-256: 07e7d0df7fdfbdad54928ae3ab6215b57fc844d8218e3c7c7d53a17725ce33ea
font_01_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 18044 bytes
SHA-256: 8093d52dfd218e89631b6283664e3aa9980ce1288d0687e643287c49053cdd3a
font_02_sfnt_off00013c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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