Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d6874ba4dc40a5…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 23:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 488c0331e0be208e082124520fd45cf4 SHA-1: 5c965361228734b6ed13ce8165a55d352666dcd5 SHA-256: 49d6874ba4dc40a5dc4d06e1c4d628af28de4cfb390f60694e6482acd1e1474a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://atpl.aero/ckfinder/userfiles/files/94959445718.pdf In PDF document text
    • http://dansungsala.com/uploads/files/nogajutad.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bf66de0d591deb28610943196c7032c5/1539116740.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/lagawemelopeziteli.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/vilefinoxijasivu.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/21403125380.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/taluzakeviragipotede.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/defoj.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ro2siimak0r6dfeh8239tuslru/34021752033.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/ralakolapujidagotubuguna.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/tumab.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/63850257233.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/78018906238.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090404132856.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/55026876492.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/85385475684.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/66277154724.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/91622252402.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff43e038b---govit.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/50080845925.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/mitir.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141159a735ad---jijuvarilujumisevixer.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/rakaxumedikidipizojenobof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+retrieve+data+from+mysql+database+in+android+using+jsonPDF 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_off0000b4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 11468 bytes
SHA-256: ba95192f64cb1acd2f59d11f42b48e77258499d0cee1effdd005e77853de6cba
font_02_sfnt_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 15888 bytes
SHA-256: 023f0b786be707658ae6c0b3b345729be69726b716b2d64166777e11bbff9922

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