Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ac75d2e76730c6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 19:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9bb1276efb7e3fc838f218071f99903d SHA-1: 3b9bfdec467fc4d3c9a81cf96e62274d079406e9 SHA-256: 77ac75d2e76730c69bbf6bc6e524dd5926cbd8e3be5c43c47cdcce9f374096ce
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://www.bash.cl/media/file/28744812360.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49da7b55a---25680986985.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/nuwufasu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/v4vdro0v2dl24tpsjovsvh1076/nubunusotup.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/golajaf.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993c889d475---58946995431.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/gobakulin.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/94681739978.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/sezulusaxutidikisegixu.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/pawozo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5fd31d9279b65b6d611801e64f2b380d/12875997721.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/bd7209f06d7490c1547d8651ea82113c/80405432207.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/nagazokebejibezagaxurodi.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/83931229119.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161216ff4106e8---muradugepetuta.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/96812145529.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/zelidojivapowa.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/jinigogitarexebisenu.pdfIn PDF document text
    • http://infunplastic.com/d/files/pegemanakak.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/9088509324.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/nifoli.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a244db70d37---jusapunopamofipaxafu.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/13501728060.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/1178033425.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/41ce22115c2def56a01bc851da1270af/89238057423.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6764714f5---vipovigevuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=secret+of+psalms+pdf+downloadPDF 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_off0000c0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E1 10848 bytes
SHA-256: 16df2285fc9773ba175fdbe02b8c25ecf7efd9429b4cdaf1be900302ebdb8e7a
font_01_sfnt_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 18252 bytes
SHA-256: d15fa6900c2877496755159204eaa71e52a031d99271d859cdda975164e5dffb
font_02_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1