Malicious PDF — malware analysis report

Static analysis result for SHA-256 503644dbe4174a8f…

MALICIOUS

PDF

90.5 KB Created: 2021-08-19 01:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1486acd3ca0560c525f5e12972eaee72 SHA-1: 1c80ac78352bcddb806aaeb95a3e86b1352c8223 SHA-256: 503644dbe4174a8fda62485518bceaed35d19b7b8c8b7791c77ca30d6bbaa0f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic firings indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to host the malicious payload. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into downloading the payload by impersonating an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089a12177c83---1416825858.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf7cb952a---xozaramoparugekawazo.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/17497168824.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160760592b64d9---govukifoxapawa.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbe3d07de---36466472103.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7a522fd01b07f65fd8efbb22f1c98eab/zigaduxisusosowasagu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f97390437---88580949610.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/t45u226lphbgm0ajru13v7cg34/22805935206.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/88289363377.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/22191730790.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/detinoso.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/4348fb46989d2b2ad111846c3b15490a/gabigunekax.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/72dafac2f426bd3c5e9787c24adabf2a/subedifotegakagugulojajo.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6f04bb32431b7ce64c62875181243be5/kufexevexapujexuzovubus.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f48a3e0c0---73004090234.pdfIn PDF document text
    • https://stopserv.ru/files/file/58489547880.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/2300drg5rpt6n1dnmbmde1li44/zitibadi.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/0c75ce19811ae0e039649088af6f7036/jezimabadawefi.pdfIn PDF document text
    • http://vodnik48.ru/content/file/1039406364.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64bb596130---navavobokiso.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/25515649448.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/272450475dce2639e5e6cf64dc9c7b53/wesipawogaditabeganenifak.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/6161c25b21b0c3dedb4a6fdac046d998/mabikasogowuz.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160986736343ad---kotuvotufonumelitijejuf.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/r4rt3d4bdmlslrmqpne3rh9mo0/41017859557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=capital+revenue+and+deferred+revenue+expenditure+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_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 16944 bytes
SHA-256: 7cb9fbb6dedbac7335de6a1eb2f3c52f264e600204984bf2aa5ca6821899c309
font_01_sfnt_off00012bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 10504 bytes
SHA-256: 2123d7b5ad4c29ca078d6a3f29d32a6060d9c8776d03e4997d1fd5a5aca08a94
font_02_sfnt_off000143d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.