Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e877f3db03913c1…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 15:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa34782b0830547772ad5aa1ba0fde04 SHA-1: 429ebeffc7d6f0a935102c0f4936e2f8b152797e SHA-256: 6e877f3db03913c1486b08dd6b2276b20bb50cb28a7369b85e441488e7d20a7d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://baigeleather.com/userfiles/file/lataj.pdf In PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/84285139322.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/23b57914dccb8e16e91421206a14fc24/45089578947.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/butonor.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c603a18e16---61311098756.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5bb7f7551ad3f1958e63d5f29c6553fb/20006929099.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///94185006121.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6830923f---wexesoxokafusowelep.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/23/14140604142.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/5lkm2biguebo1uv3euge0i8afq/jupakajofedorapuwezojuba.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/8141632840.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d795517ad---xewikabelufamizukig.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/rokipikaz.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ac9d094b---33696938323.pdfIn PDF document text
    • https://durimawar.com/contents/files/9085182877.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/9a936c1379a0d51b884998907bb2cbba/jabujuwererupomilifigi.pdfIn PDF document text
    • http://vaynhe.com/upload/files/1737769911.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/pabazov.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/fazimu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xupogejupuxosoramode.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804d16372d6---talolul.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/rojujozemivan.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/54108821100.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/kebatilatadopoworo.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/d2vlrs0lmtmqrs1evgkkmt1c8o/gowipuxenikezog.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072565f9674f---10902263821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=marathi+calendar+november+2019+pdfPDF 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_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 11376 bytes
SHA-256: 9437912658ceb0849ddf31e257caf61dd488c222d845ca002494f653d5a8ce8a
font_02_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 20864 bytes
SHA-256: 11b197f3ebc672f127897e55bf7634fbca3d360522ac7b4692a772e5a372dfac