Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38736c67bb64981…

MALICIOUS

PDF

85.8 KB Created: 2021-10-04 19:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00dff584d4521fb656ba7c1cc1ca2441 SHA-1: 6ce5bf1d28948223407cd39f45539cf23602bd82 SHA-256: f38736c67bb649819525dde054a182a42b09da5253c9a3d05e4a14f5807ee32e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://nocenzura.space/web/img/podborky/files/77986410881.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1614e06c8ea1a4---42840252684.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/gozidufoxumudorod.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161541f765d47c---80770810890.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/xelobuma.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/puvezikanogan.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/41892990946.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca2722891---70432352424.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156aa076d804---dilop.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/wubek.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/rebukuvebimisij.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/45547300613.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/jefojosipiruduxef.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/80426947759.pdfIn PDF document text
    • http://becucci.it/userfiles/files/vusotulovivekewevud.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159e03dc0814---ladivaworatupufi.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/nebolasoluwutilemezisa.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/9519093286.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/gumudiritisuriwukerusiwa.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/ziwajivuw.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/dezaxotujamemuniga.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/36360152710.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/69507107687.pdfIn PDF document text
    • http://hidropro.hu/upload/56202720977.pdfIn PDF document text
    • https://videoeffect.ir/data/file/9623192737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ps4+controller+died+and+wont+chargePDF 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_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 19100 bytes
SHA-256: e0035e6776e116bf64532f0de51db40f31fc650b3d9a323e9dda4c096956a2b9
font_02_sfnt_off000130b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 10816 bytes
SHA-256: 8c22d4b3b540e4eed83d07c881e29e28fcb43d33af338fb2f58fe61c8eea5a5e

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