Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3357dfe36fa542…

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 09:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53ba422302f6e75d9a71323f63258a30 SHA-1: 275b9f4e50462fca21bf02c9315d7a735fbfe87e SHA-256: 7e3357dfe36fa542eb9f600be19f0626d06937b7801410d22267c978bf7958df
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of external URIs and link farms strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://kingswaytyres.com/project/kingsway/uploads/file/85260313832.pdf In PDF document text
    • http://watdoenwevandaag.nl/upload/6873250885.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b8e870952348d006f4b7161176cfc05b/wibixejalexozuxawige.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9cd451621---rusufekebedafaw.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rji80kpcg80l0sj8s4fpt4vir1/lubebiwololamek.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/68893685635.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/semawenunomikudanigoba.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/157d80e7429b5b7e6ca419ddb93b2903/vamabodefe.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/dozewuzebe.pdfIn PDF document text
    • https://viettrungson.com/media/Files/79107806080.pdfIn PDF document text
    • https://amgaa.org/temp/files/nukiburewo.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/86826232697.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/89184190386.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210916210426.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/runatorogovelipule.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/jevaxipu.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/duxuzanasuboluxikawijed.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/26098229154.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/dafegitatol.pdfIn PDF document text
    • http://rts-3.ru/upload/files/kafanijejiza.pdfIn PDF document text
    • http://vce34.ru/attachments/file/84960820930.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/27852898328.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/53755005053.pdfIn PDF document text
    • http://contelex.it/userfiles/files/pebupaxomiralopebiwerobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+turn+on+adb+debuggingPDF 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_off0000d122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD122 17676 bytes
SHA-256: 6584248fab1e842f9ad6eefd74c97d03f8e18828d4f6726d0ea9ebcc5cdc8a82
font_01_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 10524 bytes
SHA-256: b1303636c209cc5253d5e0bf0271f969f00d67d3e065d6e64117576850c5bc9b
font_02_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1