Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39f7ff20d6f85f3…

MALICIOUS

PDF

107.3 KB Created: 2021-08-26 03:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa160e40e49993319da3ce65fc527b38 SHA-1: 52f02e7b78665c7067e443f8508245dded8cee92 SHA-256: d39f7ff20d6f85f3ce445c95a2b3612a600af5944d37f6c490240bf74f315578
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, suggesting it is used to distribute further malicious content or facilitate phishing attacks. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://coretry.ru/uplcv?utm_term=4pics+1word+8+letter+answer PDF link annotation
    • http://bhttourist.com/upload/fckimagesfile/nenonitakagupopuzivokozix.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9992b2694---juveda.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2u60ro8vlt6pdjacdkprnd9rv3/15025870013.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba7e49407---bogozesasipupojufe.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/d66f63e002cbbe2b7125661fc668bd51/dufafenikujukebaj.pdfIn PDF document text
    • https://actorconseil.com/files/file/17058511394.pdfIn PDF document text
    • https://susta.vn/userfiles/file/zuvuzafekogidosesewefaku.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/vawowiweminujovik.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/durogulis.pdfIn PDF document text
    • http://domario.ru/userfiles/file/87843220830.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/saponimivufew.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/58600889930.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mqhkellum7n26ldfq4mivothm5/5197178818.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f0834765a---32982533882.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/fe340f209679d7aca2d82ac0fd675b96/lovejobobaxaxiwuxefob.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4bb118268---rurakelu.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/68137375856.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96359939d2---bakesotomir.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1b34aaa85eaf762a2a705d8c925814bf/48106876172.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/81950493415.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/28704281776.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/fezizoxad.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1c44e24761f635c4a3807862436b8a18/gegavopo.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216151620479886.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/53599071382.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f06e9afd88a1d2f49cd69b684729d80/fozozelixemunaxinet.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_off00014164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14164 10836 bytes
SHA-256: 3dc5a226d112fee29b159bbbb4e3a0d3a200c047b43dc7c58ba6842f80e1f4e9
font_01_sfnt_off00015aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000172ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172BA 16940 bytes
SHA-256: 932634f48b3b0a69e13786f953450bc2ea0bf2cde4acb1f1e796c31022ed3d3c

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