Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a147e3fb04a8cee…

MALICIOUS

PDF

140.5 KB Created: 2021-07-01 12:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4fd91c6c5cd5e06c5a5314d370105f99 SHA-1: 2652dcc329534b36e693171e7c2e45a02cb9a938 SHA-256: 7a147e3fb04a8cee16eef79c9635f01e85d58bb83307e0bb71b55c84b7c51f2b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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 http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608937c429d7e---tewemodepumazaw.pdf In PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13e888a76---44480295771.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071e39bb388d---gixenogaj.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/72617897490.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/sefulemubududikidoputuj.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/f6eda452fd35c459899e530cb7cb2b46/74039495806.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaecfe02b3b---gowiwoxofujog.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/e4f88238ab5df10ed15882b5a3e62d63/goduwupivilowe.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/06e24ef1dcdb9413ce64b384239a0b09/17780372480.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/32055921c2299d56ac5dacf8c29537ba/polevepage.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c098953e---88181821306.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/846c407dcf5794f9c10151e45cf27bd0/dibewivanefumujibezere.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/6u43tfq58j1j0ehk229prfim25/63117347976.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a503dfba4---mafogejodutupenubelol.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/j2n02vrffl44n46ek6e4c8nre6/pawexi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/diwerezalubujavinumasodof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bebf271f1---polarejuk.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/h7hsjmbn321til50i2b6r40ffv/jipozivesararebegamesezi.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/kosedavibudegumejujafek.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baec55b70ef---94806710757.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/409cfe92af2add4ce944609d2ba9370f/nifupoxobafulipez.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/dpqkdfkaikto10dceik7hko082/12579676781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=find+the+sum+of+all+odd+numbers+of+four+digits+which+are+divisible+by+9PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A860 11576 bytes
SHA-256: 9127a074883d8ab409680e2253b0a2d850d5f1fe8090cb9fbf9e89ff3a399969
font_01_sfnt_off0001c37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C37B 19012 bytes
SHA-256: 7e3f7da564a7ebf063723497f4c7f48a67e22763ec22d295d05c085bed610088
font_02_sfnt_off0001f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5C0 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off00020af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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