Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b7c3cad36854f3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 16:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: def703eafeb1a0b519c2c10a8e53696c SHA-1: bf9c2f26ed73ce8484b6b64e7fff75c23fee0190 SHA-256: 68b7c3cad36854f3131a60da97e8898913eef1d2a9f5a82c21568710d66547b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/14211152888.pdf In PDF document text
    • http://parbatsamajjapan.com/img/files/files/36875368262.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/dljmsum19nc5imk55ptcin3tlg/75022803013.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/sakib.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/watawidaron.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/81272831087.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/fefad.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/92443308552.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/9133196258.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/naxusinefowaju.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906170159528.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133684ee13dd---40670177146.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/49848442478.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/073f197ea495080d1e991390871886bb/80456333639.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/seruzexazuv.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/dakejawov.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210908_070558.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/nokijenapipafelo.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/rasiw.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/kutola.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/64748853157.pdfIn PDF document text
    • https://bloc-immo.com/images/juzupivudujolapale.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f56bb8a76---24824577273.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/wozajopagixusomometavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+unroot+my+devicePDF 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_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 17632 bytes
SHA-256: ad6990de492b144804dc6a18e91148dbf7bc7047cc4b8dd40264df78779b486b
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 10512 bytes
SHA-256: 4fda9708f4b92d3e683dd4562c511d904bbb787fe8da319cf0df8830e5e09194

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