Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0e39314b1ba430…

MALICIOUS

PDF

81.7 KB Created: 2021-07-06 02:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4deedfcd56d34ea8191909e07d094d9 SHA-1: 2d0ffe7a2a0820c6f102fa2129bbd9f0be45db66 SHA-256: 7c0e39314b1ba43082e9d57a3e66aa707da561ac0764115141fbfaa0300e6235
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=divide+check+your+answer
    • http://kag.fr/userfiles/file/42468301313.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/39289041225.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17a864bda---fizimikugekalodinokodagax.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14848fd17---83728331985.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/wizawokujipojeruzosanek.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/il73hnedsh60ue05iflijp1tvj/16862624694.pdf
    • https://cape-electronics.com/media/file/bibof.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/paputabigivoboxefugarok.pdf
    • http://aceonlinementors.com/userfiles/file/47826323181.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa12cb4d27---70786027625.pdf
    • http://kengosushionlineorder.com/uploads/files/82166831605.pdf
    • http://accessprecision.com/userfiles/file/jixelizuvatalamufulonezel.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa78907381c---8168898799.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608254fd9cc44---62864339700.pdf
    • https://tranduongauto.com/app/webroot/files/images/pages/files/kejew.pdf
    • http://asremajazi.com/uploads/files/samatijaximofufofaredage.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/693a521d253d585e0062551731f6322e/82176851333.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087fedbcbf9c---zidavavokipime.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b438657a3f7ff0810b5da859e7d3a833/69838686616.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/hc4c0o3dp0qjgfh2gikikoh74g/funagabesipaw.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/jagajovupadikamoselak.pdf
    • http://kimyasaldubeller.com/upload/ckfinder/files/3190359016.pdf
    • http://buergerforum-tirol.at/file/69060334856.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6fa61170---rexazigatujaxukodixabebir.pdf
    • http://industrialdevices.in/uploads/47602042753.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7320c58349---11369559510.pdf
    • http://helloshoppingnepal.com/userfiles/file/16644638224.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c709.bin
817d750fdf45c38faf966f053f19a54fe1c44ed8e4638def2800ff0af81a0810
pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 16920 bytes
font_01_sfnt_off0000f2df.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 16088 bytes
font_02_sfnt_off00010815.bin
4c91805d5749ce4ba543a1f010f11ebe6ac1b2ddd417f621a285cd839f12c43e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 10784 bytes
font_03_sfnt_off000120ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 16792 bytes