Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c53379d42e849a…

MALICIOUS

PDF

81.7 KB Created: 2021-06-09 00:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 952c68f4c535eae73f026df684b7833e SHA-1: 4ec42559787a9920030edd3fb411a892dec4e44e SHA-256: 55c53379d42e849aaafacf7d2eda0e5c8fd9ebf401ce28e3e0d915da8cbe5003
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic findings of a link farm and compromised CMS upload links point to an attack pattern focused on redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=9th+maths+book+2020 PDF link annotation
    • http://gfb.it/upload/fck/file/kiguzobenivapit.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/8190a0eaf43840ac7aae3694f0a2ed7c/jesulumojizukivigitumob.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/24377728606.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jtadi50aq1fgb73h7r0gbjpatd/baraset.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7d343bf1e5e3c243b502cf2374efbb18/96177679468.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/23762670446.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/fudubogoz.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/gugemutegarilojobubape.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/94511152173.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/24a34015c4a2b7b2012eb93d631989d0/69381807837.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607217fa56495---rozuxokikos.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/92687389906.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wukemun.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zupejexezoz.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86de342936---44063917341.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/nubaximur.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ngdinbcgnacm1it7b5rk2tb8q1/mobiwalir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 5336 bytes
SHA-256: 9530ff3f5c568dddd7e176a2f80425de8b41ff6460f646710ff37297f371a254
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 13804 bytes
SHA-256: f4beaccd09ace2a85b90e0d97d06390002bed35e096a87f63ec25a8dd063be86
font_02_sfnt_off0001174e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 10040 bytes
SHA-256: 4e29850429f4cb5b47494469ca173323b9fdd12ff218f16a1ff24b7700ded9b0

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