Malicious PDF — malware analysis report

Static analysis result for SHA-256 2989747cf3b68172…

MALICIOUS

PDF

81.8 KB Created: 2021-08-25 01:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 467e387f86458b5d1ad973fb14817b3a SHA-1: 70e7483b520bec04ae38f7f3d4b0f44d9f1e8a4d SHA-256: 2989747cf3b681726f6bed0dc1dfda1f6771bd1fec03323e69c94fc06273d7d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation or phishing. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nusratali.com/userfiles/files/baporufevejetuko.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8268fe1d05---35275961818.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991aa040984---57619589018.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9c7926079---bifawexotojosatekid.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc660d398---14982160998.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/32444950043.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bgjc9rr7he7dsfgg6kvgj4c5tl/taxofewogumaxevagurixo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/aefc13a24705630df73ed8d3f4a96177/rebomeloxetize.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/64662911446.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/62058089477.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/186e7cbf713f93c49e39b3dc82bbb1b5/80197980402.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/16949023129.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/begafalatozimojoze.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e78db6a5c9---xopoduduratakugu.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/81655783229.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/99593671625.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/71951673974.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/xojoverewelaxawiwuzebuvaw.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210730_0F2C4CB024854DCE.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/37967766503.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/konifevodukadarurofumapil.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/javafawiki.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7f3815ce99140fe748a1929d1ef75e80/zanirus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=8051+microcontroller+and+embedded+systems+mazidi+solution+free+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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 17096 bytes
SHA-256: f826008026ccf627ad5818f1c5ee8cb148b5c2675268c33110baabda68bf0c11
font_01_sfnt_off00010570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 11556 bytes
SHA-256: 20208ac952b9900ba44a79750bc089379f21c80b43c69e6573fc65ed6864914c
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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