Malicious PDF — malware analysis report

Static analysis result for SHA-256 894e3d94a819f868…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 14:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 658650d6534ca0cd50cdd89cf8492a5b SHA-1: 2b8eb82dda33c8c9cda46a8d133a0ce7c0d1755f SHA-256: 894e3d94a819f868d251223b0efed69555a73745b0fa33d330a5ee38574f4004
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a secondary payload, while the link farm serves as a lure for users to download the malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=how+to+send+files+from+mobile+to+laptop+without+usb PDF link annotation
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16130e57d38f79---82549273404.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/xeguxubak.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/zetalijupevomemiwan.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/56995907249.pdfIn PDF document text
    • http://atya.eu/files/file/duvejemowafanabuga.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/vezujutojolape.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/godulubirewulerem.pdfIn PDF document text
    • http://c-six.it/userfiles/files/pubarovon.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/samed.pdfIn PDF document text
    • http://chromavials.com/d/files/daduzak.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/39233605400.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/sadinuxenowemejuwodixa.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2c4af0ee2---sunaruzo.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/15150325764.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/94085986190.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/50881519899.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/sagomumoveparixuzo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b033eea49b---bosuginolubegunit.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/26158190655.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/32347700364.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/jidaweworufujamixoli.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/59529690988.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/27512128716.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/golutip.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/60936415394.pdfIn PDF document text
    • 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_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 18260 bytes
SHA-256: a704bccb9f855f7572f2b1b5ce2802612a0228a8bc9208a420e31c74b4b56a11
font_01_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 11080 bytes
SHA-256: ffd20ec2d5af8b993ae95c6a27da2ae40a495c1a0d362102d06701270c6948e3

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