Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a8463ba4ab7f9d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 17:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 980a4f78b3390fa54e354193bda6c57d SHA-1: a5cb16d8996444bc823fd6854ec27704dedf8f70 SHA-256: 82a8463ba4ab7f9d892cf2057326a109c46b1be46793718b328ba438953f4d8a
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. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=jack+o+lantern+story+pdf PDF link annotation
    • http://clarasonic.com/upload/file/87452290900.pdfIn PDF document text
    • https://manenshop.com/upload/files/ledipil.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/revafuwexozevigimizofakok.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/90592091808.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8e7588c2214e91324e96692905eb4e06/xowigipo.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/gobexikonizaxizumi.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/befokosakaw.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210810_085549_134.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612df7979b09e.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f2a393c60314b934150cad45a193fb6b/66284028241.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1aeed3aba---69386796174.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/gososofofizubopavowi.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/23975853716.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63c1c528f---65684125244.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/tozeg.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef44420275---kexipopokoramojobosi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160defa4938e17---bajukaja.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2c0a1797---23321116879.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/35354345329.pdfIn PDF document text
    • http://reopen911.info/media/file/34461889361.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/54907577266.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/65993722975.pdfIn 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://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_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 18144 bytes
SHA-256: 8feb8744554cfcc0b025c0d81de7e7ed6efb574ec0c2264e56522279bb15e051
font_02_sfnt_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 10716 bytes
SHA-256: 4a952cf061eeb2085749abe28875c4cd0ba6f350f65e61502798b670c0647f5b

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