Malicious PDF — malware analysis report

Static analysis result for SHA-256 0937c44be66b0a77…

MALICIOUS

PDF

78.6 KB Created: 2021-07-29 19:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee524bfc7378b065d2c642d07a7f824f SHA-1: eab802bdb092e4d15d38496f27852cd9843ac589 SHA-256: 0937c44be66b0a77d2bf86f23374cb5c84f1fd2c869ad8d0ad7792d84bffdbb9
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The document body was unreadable, but the heuristics strongly suggest a malicious intent through the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f094ccb316d---65856342181.pdf In PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609134162b433---94603793707.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a81ea5d23d1---77998392232.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b75029a0ecda8a1d5a09000e69e48ebc/58875629294.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/12737003711.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4015ddb9b---85345355123.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bidasadamoladimin.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/77538059254.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/gazamafifilepis.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/96227664481.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076daf2aef27---37129752761.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c677ac0fcc6---92827339350.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/99728095735.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/suzosezidudanus.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee31c49ecc---lenipotusuxilixap.pdfIn PDF document text
    • https://trexanh.net/upload/files/59476433318.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///zefadaxujisutawobivametax.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af925d33f40---jawajumapuxejafuluxajo.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/wudotuj.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8ba620e68323b7287a3eb66dffd9b682/tatagenojukufewaxurenejef.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8134f1aebb---45848926876.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/sewaturekotodofivabebajoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=farmacologia+clinica+para+enfermeria+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_off0000ce45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE45 10676 bytes
SHA-256: 1519020936fbb16273af178eedbc9b9f6e89be45cfc53201852881dd108e033d
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 17776 bytes
SHA-256: 732cd2b924f904f774d3cd6f13892958003c7f46a171aa3cf4fb7c0300af35b5
font_02_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1