Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95c93c062f62509…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 05:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ee7425270eb8fe47b96c6f24666d808 SHA-1: 2f6f4cc8220777b86bb5da662bf1f6795d50debc SHA-256: c95c93c062f62509eb1cc506a4f8edec98ffb60cc623abf273e30dc8752ca39d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of urgency lures suggests an attempt to trick the user into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kalyna.ua/sites/default/files/userfiles/file/mujesil.pdf In PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/72029915167.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6b36c7f6317bc6cc47c1014d8ccea07c/sajikavemo.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c1827e4140a1e1f87c6c43fd6619565a/31982730096.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/losep.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3df1963322572fc74472edf2fe025612/rovumajawur.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/080151012630.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/bonabofozoreve.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c214a338481---64071978562.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021081805220136.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/ftq1nqg28fkd1khfhln3pt5neh/61890655052.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90e75ed2de---fuvagapidirokij.pdfIn PDF document text
    • https://windsbs.biz/files/file/9730295957.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/09f724e7f4dc5770bbb19ab36312c5e4/73631867048.pdfIn PDF document text
    • http://www.celso.org/download/73651685734.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098ed98a6ab2---fopuwit.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/36394902849.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c2c572df44cee1d9e70633347d6ea62f/kilofenuziwidu.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/291349608c494861ea51108c3657c9c7/81808483864.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/19713184419.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/bagavajemilo.pdfIn PDF document text
    • http://arslanemlak.com/E/file/bolimisivamomo.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/69263397337.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/feledoxepafidexo.pdfIn PDF document text
    • https://morabia.fi/images/file/7517814069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=total+hip+replacement+surgery+costPDF 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_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 10996 bytes
SHA-256: 1f29c6267b9d055484e9512e4677aec318e8ce79238f96ecd57843f91c96a6b8
font_02_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 17100 bytes
SHA-256: c3479d32f48e5d73152ef7b767d99035e04e0c8bfb1a4d99859515ad3d3f0d53

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