Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15d091ad279f0a5…

MALICIOUS

PDF

70.7 KB Created: 2021-09-07 06:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17f278c7cb31da14945af8d30086e0fd SHA-1: d331b54a4cb044b1d425a3a34cd369157c53a9da SHA-256: d15d091ad279f0a5562fdb2434735ecb5690864bbead7543cd3793e80241bee8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to a phishing site or download a secondary payload. The embedded JavaScript is the primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=sierpinski+pyramid+template+pdf PDF link annotation
    • http://signaturecruise.com/js/ckfinder/userfiles/files/kofapemerakugawel.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609244349e97d---tosipijukofuxu.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/84244336876.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/e7ffce8c2ea9d399c2504d20b304ab73/badalalawaginib.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dfb20a02a---78045696416.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/wokosomat.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/7fd3vhdjl01438fvlj719a9ifu/94115664870.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/85505981636.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f023a5ae9e---79474456723.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/82281726014.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/72334886338.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/xajadewegapuzivepasireg.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/f98f9fc36d4c023f4042b42dcec84c82/42420492609.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/67948635749.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce711b038d---nikubupapojamutulepovu.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/71363736730.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b729cdc06e1---91258981307.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/20109687992.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/rasogukit.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/dopixatoniviz.pdfIn PDF document text
    • https://gulamanis.com/contents/files/fenemazuxalejarixove.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_off0000b4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B2 15840 bytes
SHA-256: e468a782e2769d18322239679f7aa8e7108454da2b0ef29152c0f5dd9f9abe52
font_01_sfnt_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 10820 bytes
SHA-256: 1fcd0f8fc7526ab4c9528a576c6a80c77dd2a82b1be1f52555414f9fe0921dd6
font_02_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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