Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d85944a24fc070…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 01:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c7414182c855e9bb899c0efce915a8f SHA-1: 610c13a074e2c9e1c8ac37cd597cfe6764ccdcf3 SHA-256: e6d85944a24fc0701a1a3edccd9a93ccae96a4a23666a870c0ae873d1cea8921
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to disposable hosting, some of which are hosted on compromised WordPress sites. These links are presented as a link farm, likely intended to trick users into downloading a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://amexeuro.com/an3_Uploads/file/dejurutunigo.pdf In PDF document text
    • http://civicwomen.com/ckfiles/files/nawirimudejofogozobab.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/zinenozuborowijilurizak.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/46909531405.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51804e3db5---97477060592.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/bafurezizibu.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/fofuvovofux.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/gajatukafupibemet.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/55930624860.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b32c7e9e1---dizukavapurazodaz.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/81739688203.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/73932340370.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/51508424611.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/xudutujaxafiw.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74a1d5184---19296847872.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/tuvakidakojo.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/67207741395.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/2049774384.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/nuzizepufagotewaxetef.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/pomumoxiragefibadef.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6c1b553ce---dazuw.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/saragoxipore.pdfIn PDF document text
    • http://vinmexindia.com/uploads/segidedebovuzujal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=stata+15+manual+downloadPDF link annotation
    • http://arks.princeton.edu/36b98435/dIn 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_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 10364 bytes
SHA-256: c21237ba567a863de287f35559914dccc06a97a9c3d38170eb834262c3e20480
font_02_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 18508 bytes
SHA-256: da682440dd435aead2aafc69a2705c06b9d58de6deb7389257a74d3bc82e60e5

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