Malicious PDF — malware analysis report

Static analysis result for SHA-256 30bd8cc283cd7d8d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 14:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df3a3f60759fd539a1ab05653b99b0ff SHA-1: 15879623de87ba4dc8504c422ae0589aa229f597 SHA-256: 30bd8cc283cd7d8dddccc29b165645269e734720ffcb41fa41782b2facbbecc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to direct users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://synerhu.ru/uplcv?utm_term=kandungan+ginkgo+biloba+pdf PDF link annotation
    • http://anandtouristcorporation.com/uploads/gifafafige.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/43063902305.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e96defa4a---64131139856.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e1bed8e2ab0369c6fe886121ae22a58a/25833598934.pdfIn PDF document text
    • http://aqcons.vn/upload/files/24643846813.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/49281837682.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/womevatasibunusifuniguzav.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a60ad3f57927ae408f5d256a89a9eee1/raxemuladajosofugavo.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/tejirusinesurutov.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/rn0pub2sbo7im62lndtgokb8fr/90532749791.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acd2ebdc4fa---nebuxoluzelotazinof.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/vorulagolobunota.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5a86a6ade39e59ed6053767885cc5743/nefagagoma.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/petukebefinepafufizafovof.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/linase.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/66089903598.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a2ddc2581d3b7d66b1069842617b4218/3782499257.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tp5an79bik1rs9n14s0drg23mg/42272456459.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210708_073950.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/liketisakisiwajuda.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/62959935652.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a98204f7---litikubetalipaxowilek.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/29027776507.pdfIn PDF document text
    • 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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 10496 bytes
SHA-256: be27e887fbba5b017418f93c4e7d20cc5fd08d0469643035d71bc4b677dfb93f
font_01_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 20976 bytes
SHA-256: 02903e3eb69cc0a81d6d4e77ddf30995c2dd46a6e6bf05fd82ea2a1858e6b27d

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