Malicious PDF — malware analysis report

Static analysis result for SHA-256 912005106b56872d…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 11:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 10559c1b4241f21248b7a974518a2826 SHA-1: 9b469ee238b71f7addc5578c8dcfc3258b563bc8 SHA-256: 912005106b56872dae485e942c7285ab87f6285d169952368d1eb21ad5cbddca
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://ketchas.ru/uplcv?utm_term=pentatonic+licks+saxophone+pdf PDF link annotation
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609becc0b9a7d---domoliwimazifipu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121ca8f1410f---97480568375.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/nopogusuvotolu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607338fd99fe4---zevevokivusowutemuxeka.pdfIn PDF document text
    • https://wagaskar.com/media/97320474732.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a0285ac4---zisedowarabetib.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/fdbaf0997cdb0ade0d9018ed156af2fb/96722529664.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16115e68f036ad---xibopos.pdfIn PDF document text
    • http://sparkpro.lv/content/file/2340324368.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f711704b82---mojufuwijakobodekeg.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fb8b52333---vedobitaxudinakebapugo.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/budajonajigud.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/31977822696.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/64mrpc07dsjd3a8jus9e6ltrg4/nukewipi.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/20023890992.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/c3429eb612405f12febe78310b502dd5/27054944130.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/xojulug.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160877ff7eddee---fogegovufobe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cc9fcacf7---rekavalogorotexozoj.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/62061393930.pdfIn PDF document text
    • http://df-foundry.net/d/files/dezexironiwexiwa.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15662d7b7---zasadezunopalokab.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/86853290184.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bdc62452e---donoti.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_off0000bbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB6 17200 bytes
SHA-256: 135a6b10fe5a12d52b34e629bd0486ad7ad2c4a993516cfc523f337ce3cf7184
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 10812 bytes
SHA-256: 73f4378ec4bfab845ad099cf31b9c3a891e001c6d856d4295e1d3b1444c9f821
font_02_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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