Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d0129cde57600f…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 01:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2028042712c9188b23a1c7e55d47e694 SHA-1: 596b43486236d22ee1485c0565c1483eff4e130f SHA-256: b6d0129cde57600f00d710492485ad15ced2cbb16b19b983729eb7134ebf6b81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://winso.tw/userfiles/file/56926509336.pdf In PDF document text
    • https://oancora.com/ckfinder/files/85061371667.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613022ce57ce1---paxokoj.pdfIn PDF document text
    • http://alkanboya.com/files/file///nelanafa.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/68774011187.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/lililozikulizaxos.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/24940092360.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e386f2b65c---18229139588.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e895bf0da885e56cf7bde9422f6d3380/lijoz.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/69813907963.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c91fdde85---86748266352.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/gupejebewefodop.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac28963da---37727589163.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/ripulikaj.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a081d703---34284680243.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75898068218.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/kufopetadakirereruwenokaj.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/wegobumas.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/64467325837.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/xudomesesisoleledujitow.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbeebf994---rirubegowa.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/dopezotufilawa.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/ralaporobawam.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/8599009018.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/nakuvovejofudif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=maharshi+full+movie+in+teluguPDF 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_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 10820 bytes
SHA-256: bbf47aa1a1a47da80dd81f0cd66b3a99db40b8be3cb63ba88e3f15237701bd2b
font_01_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 17392 bytes
SHA-256: f9de690936a25f0ef4c999877976f85861f47d57563ec9cc27590599f1c56ebb
font_02_sfnt_off00010d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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