Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e801c10199e8a1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 02:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e7ffd50c4dc736fa2c186ac847eb92e SHA-1: 383906274799fd0836886c2b217df3f249ebb58e SHA-256: 08e801c10199e8a1ec20cfcffbe9b5e2e344579f5896db2b5d5c0452106a5408
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 uploads or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF link farm heuristics points to a campaign designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.salac.cz/ckfinder/userfiles/files/bedodevej.pdf In PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825be51a1c7---91960443468.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6abb643a57d1b5d3aad554925b7f05df/dokisa.pdfIn PDF document text
    • https://soechi.net/userfiles/file/94947783701.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/89890634233.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/18895590346.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/62524238303.pdfIn PDF document text
    • http://apcmagon.com/userfiles/97815860457.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/20740301139.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a4d17ea76---dexazukiwafew.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/46862305111.pdfIn PDF document text
    • http://12shio5.com/contents//files/15857129129.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/muxifafeto.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/443f4cfd60a8bd18f53825774dc62d63/fixegunabefebuvijabapigow.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xewokipujorakukus.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210816082315_asdyds.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/delubu.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/60603008690.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c719aa2e---lekepotax.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/62768298169.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/fo7o2h1f5fdr48687avdt0tl4o/pesujetoxuse.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160737408a6faf---50786441066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pdf+editor+to+word+converterPDF 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_off0000c537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC537 10248 bytes
SHA-256: 6d44b23da3680a8f5d8c9a641a75fa956f0477ada155d62f5141dfe14589d98b
font_01_sfnt_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 17644 bytes
SHA-256: 689c38c7e49f70ed4491d9843fa7aa7bc325b7031e2e80b81965b52205965701
font_02_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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