Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb33448c435c059c…

MALICIOUS

PDF

90.7 KB Created: 2021-06-17 02:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f3127462cdb10c4e8d5013833b8c13e7 SHA-1: 34fdb814169f3f1a9e2c91203aad14786d714d6d SHA-256: bb33448c435c059c58b417937ac8e1d320b1b7db354cde4ae914354675804b94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of these links indicates an attempt to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://wastran.ru/uplcv?utm_term=change+into+comparative+sentence PDF link annotation
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2023d6e700048f901d98ee965df2ea55/jamazebijun.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6bde75b42---53506524675.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/nakezuxiridinafu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0212dc989---12443042724.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc802d0ee4---55547962099.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f49eaf67---34233941465.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160964de928a3f---10564442021.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db7688329e---11574547743.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/82286833891.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/57546154256.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b55fe9dae71fe9d0800cc2016f178d7f/wimuwizegutuwovetemo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/41e9dc49cda3b72d18f133c9296317a1/zijenotanekezimo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d863f1c9d61ed0f919a8d6fd915e04ab/bunakizamunerukezifiro.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee50abab82---jexukugivodekalo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160706be01b2f4---kopozizedopojej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 5184 bytes
SHA-256: 6b77285b7b570d88fe57be2cc4839913476005a1d3ed765e31ec39bae7e4ad36
font_01_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 8896 bytes
SHA-256: 5e13c213d96945782c6e6b7118369581a65a898060395439e56a0e30013d960f
font_02_sfnt_off00012bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB8 10496 bytes
SHA-256: 675bdc8079de50a583ded557a723256ca50465bf40153bb264ca92a555d664e6
font_03_sfnt_off00014fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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