Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6af073af61c753…

MALICIOUS

PDF

87.4 KB Created: 2021-08-01 15:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06b4111ae53d33332d7fa5352b4250c5 SHA-1: ce31fc2e4fe734a731fed4a7e8cd53aaa2ef9302 SHA-256: 5e6af073af61c753e8edc20065ff36bd9081e5ce08354ced2264749f3a88741e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on compromised CMS uploads or disposable domains. This behavior strongly suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://exmar.it/foto_fck/file/10527370675.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090bba53cc24---xenoralazabutaferuwaxobep.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608145e993008---33682385797.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9f20913a5953fbe12f68cdb21f29a915/60914603041.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/24123515006.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728947de9a3---zusejijevakidikuku.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/rogezu.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/55633194802.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/63770814197.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38cc30dd24---57097577576.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba1da8c75c---9527470984.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071054b70d5a---48405881783.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/20006021220.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210604191443.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de4ac8b777e---92438438857.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ed3106f79---wokatulotedawenuxefiwi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5392315245a8bd29b2bd764c4ba6a26b/nuwulubotunoj.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/36996526746.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/debobididu.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/tonovib.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/metanojovi.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/rab276j01jd6om8ps4pip91o8s/gigotipajidibivezipo.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/20923541709.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160918960292e3---vavitajozesup.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7857b2eba6---71726120875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=moca+test+scoring+meaningPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 10520 bytes
SHA-256: f9e6452e264a8b0c9834d2d399443aed51454f00d4dd39e7ec20ee07b86edcf8
font_01_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 16916 bytes
SHA-256: 9921438f3918c4fb0ad655a6ee6c9d7f087d8221fcfa922afd3225f3f0b6a4fc
font_02_sfnt_off0001377f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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