Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9ecac2e925ae03…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 07:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39d0a498324c9904eb36f697496291bf SHA-1: c1bc895e1ac463444dd19554ef10baabfd5adf3f SHA-256: bb9ecac2e925ae03b122607287e4b0668a1d57078db048918d56f60291673ad0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious domains. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2ec2e13313b1ad2e023c808d26f26257/41977248228.pdf In PDF document text
    • https://flomogroup.com/upload/files/bogafiwufizuzabujenef.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/58444444815.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/57111039364.pdfIn PDF document text
    • http://webs123.com/userfiles/file/jevezagemi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/85og6su6t9tu2tl6aldjvc1fdn/56829932390.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210906_691EB3F4290DC152.pdfIn PDF document text
    • https://inks.bg/userfiles/file/28606182818.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/54547944761.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/5735060468.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/fizunomolizojade.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/55017382864.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/bumikowutebaxonigo.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/wuwaroletijepoxofut.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/55928110770.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161356e823755b---gefuke.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/51755555479.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/wewarekaf.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/05a2b30a1591aa34f29d23262f08b57c/neravigulilel.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/tusuvugusezamagupigilus.pdfIn PDF document text
    • https://norservis.cz/files/files/8773739892.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/vafabelax.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/lonasopijodurofovunowufi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/28of3fmsehl6jt0k6big97fhjl/mawefuzowifilat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=apk+restart+androidPDF 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_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 10412 bytes
SHA-256: 75dfb64cc98dc29c38446a77b3dedd6190bc53a0e2737981ea6d6e2429ccc0f9
font_01_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 18648 bytes
SHA-256: ae04bbb0e28fc6ae74b31140af9a2921fcfc2f8967e8146a06bb7486d546e87a
font_02_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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