Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfb5ba1bafa63a6…

MALICIOUS

PDF

100.3 KB Created: 2021-08-21 09:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 852499a57a24023b932a44f0ac18fd25 SHA-1: beca4751fb9d1208b54cb58059a80282c320bad1 SHA-256: 0bfb5ba1bafa63a63c9e797f8911fa9b8e71f7316427395385d8ae5928115250
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://finproekt-msk.ru/userfiles/file/45508403119.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e3082f5bd---45567989146.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef09c0043---supixaser.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/284bf394a7ea1bc734dd1de626c185b9/xusizubuzuwagewon.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/kabutumuwovipizusib.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114328f5708e---mudadulis.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/sabudaju.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/vovuromejipu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1jnbu6c7aius1idfm8vn1v9qgk/54880303111.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/40100443265.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/daa7cec1e30eecdceb662d18ade5c816/pobek.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/jisalufuxot.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/bowek.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/46120422979.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6db670d1---95295159298.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/37eb23f272cc763c0432bf64ea6e93da/44189682304.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/cupt8a0qdk46oir1vqqrmru243/23546331703.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/sirukuxizamenorolex.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1ff88762f7fad96aa00f6138faaca875/92312762564.pdfIn PDF document text
    • http://df-2.de/images/daten/file/bunipalitizamopariti.pdfIn PDF document text
    • https://areicon.com/images/file/33168807195.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/pugenereviraxisonumo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9v9qgafjf12j7jvsmmh47pq8jb/runerusowo.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/65953540515.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/30b1166b03f2837d2c63ca77a211bbf4/47647654157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+free+unlimited+diamonds+in+garena+free+firePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 17472 bytes
SHA-256: dd5cc753abd2e8fb27def0f30554803c18488cdc7b3022cee7c1e71bc75aef8e
font_01_sfnt_off00013c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C72 10876 bytes
SHA-256: 26bf5b05f2b63f21672bc47974879317916a36c46b8905addb1e7cae88f1f96f
font_02_sfnt_off00015564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D75 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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