Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dac7e6f466bb91…

MALICIOUS

PDF

87.9 KB Created: 2021-08-07 10:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ffd464fe5d080debc1cc988fccf0c585 SHA-1: e0e41a0912f51c8ab7aaaec5fccea46fb7a7c913 SHA-256: 39dac7e6f466bb914b58d175af66087aedaa31b0401a4f4260b528f3575ffc4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of a 'download' button heuristic further suggests a lure to download a payload. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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 http://solee.cn/ckfinder/userfiles/files/36692979231.pdf In PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/gesijusiniwutoxukadalavu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f54a6520d---gubiraduvelok.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b281f0b06eb---69577696249.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/81f0a3d100ef6dc7b0ac99643ce1dc00/31588763404.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/36690920983.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3022ab9cb---zexufazisipoko.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/66836623573.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2bb70f93d11350683eaa0e96bb1fa427/vunurupuxobadafazixenika.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b334f8e45ac---14806561610.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/veluvegifivisawagugu.pdfIn PDF document text
    • http://rykatd.com/files/90151119225.pdfIn PDF document text
    • http://dhf-china.com/d/files/japofemojemom.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/sokuvujiwaxanijerezas.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rk9nmu735hnpg7hddfemf0el56/35331979288.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608420d99053d---woworobopanimazagiwob.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9f9d0bf26d187032e376ae996c19c07b/63845202768.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/dojowi.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/xusomijutafubedixekijevex.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/20981317921.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf86533f6c---bepasirijevitokes.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/wuzafejavaruvipav.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/sisigivugu.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/21467418945.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/17755370017.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ff2d27ce---mafivaxaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+calculate+carton+box+sizePDF 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_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 17664 bytes
SHA-256: 4176914bf8d38d4fcc93c343320fd795f4cd1f7bc2800e8779a9b9a8713f9148
font_01_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 10704 bytes
SHA-256: 96d735e20e74e67d9669cc5b0e76bdf26aaefddc73604308f186f7bcc465dd95
font_02_sfnt_off000139e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1