Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8dbf428d243db9…

MALICIOUS

PDF

77.7 KB Created: 2021-06-25 04:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cda57fdfdfc1f7cf4b17068fa6572004 SHA-1: 93452b6e1722ac40b2575c300782072545ca7ed9 SHA-256: fc8dbf428d243db91fdcce389af5a0e0f8a96dc68dbd52be25e8f25131be508c
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'game vr girlfriend' and application metadata, indicating a lure to entice clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=game+vr+girlfriend PDF link annotation
    • http://leguido.net/files/wezemigaxemidorusakogaxog.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8bbc7a3c2---jozamuvidimovudusa.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/24668273244.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/34068896618.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/82860554610.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4e78c6b1---24862331575.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/josezimitebekufep.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/lesosalafeligitotarunik.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c0229fcd---dovagufofagodujepam.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078647eb7d64---37033677862.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/jalinov.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6ec53a993---xinalixuguwukomozowokez.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/48479452573.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/nuvageni.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a220b2c8---93984991156.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 4740 bytes
SHA-256: 6658a623f76781a11bef078bdc5723715e9301a679290475fea29202a69b6ad0
font_01_sfnt_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 10360 bytes
SHA-256: 8cf4d642056317610f491bae5b27d80c7b2ef66103bc76318a10dd72007ac5d3
font_02_sfnt_off00011c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3