Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c6ab8b2acb154b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 16:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7dac0934e1a5d88f1cb4f3cdd0ac7c89 SHA-1: 6ee469abada4977ad94c03a2dbd586650e1fcae2 SHA-256: 68c6ab8b2acb154b657da378ce7f63dba4e9c7fc2be66fc7fbdcd9d665b1708d
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/34211e4290247452efc12813f34a9687/resurulemogagagodisoxa.pdf In PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210913021658.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/kotopotatuxuwimugera.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/32830466948.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/tozubonikiveg.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210918163822.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091416281235.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/36567814783.pdfIn PDF document text
    • https://zzhqhi.com/d/files/89377179077.pdfIn PDF document text
    • http://palami.by/images/file/89782589390.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/diwewivut.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/vezeretatu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/oi26mo7gqakn7j8hva8fe5rk46/93558878250.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/38593733308.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/30079730100.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/84885095852.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1f8649b4ed96d994e31e9b8b939756df/luwutavetiweketasarosir.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/fasixorelam.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/71007130369.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/joxigomosobanav.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/folefonademugakifosogugil.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/13615463600.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161452fc4c5ba5---2721702779.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/soripijoxinu.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/46145030896.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/37510877618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=friv+frog+gamePDF 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_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 20452 bytes
SHA-256: d9eb84705f5101c595984ed6ce8af7bf7993ad28732c05093758ba0104233d5e
font_01_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 10184 bytes
SHA-256: 36a97ab18efce580e78b51644bd877276a9b5b28dfb9ca99f3d6de7fe74e8ae0
font_02_sfnt_off00012a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1