Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a30c921379a667…

MALICIOUS

PDF

92.5 KB Created: 2021-09-14 14:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26df1c8ded3ec94be4dcb93228cba8d6 SHA-1: 6042b9a1a369597523ecd426b8eee8a5576dedb9 SHA-256: c2a30c921379a667a185082f368907436c2dc20e724077474ca2a53cea5e086b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm indicates an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=onenote+android+handwriting+to+text PDF link annotation
    • http://msslink.ru/userfiles/files/93540501913.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/sitowixisufap.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/6897946703.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/5273940689.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/jinanuzajivo.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/nipexesuvar.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf7180a7f---mefal.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/sofekakug.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/wexuferenop.pdfIn PDF document text
    • http://cartopack.be/Images/file/dotofolox.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/mufogikejikuguk.pdfPDF link annotation
    • http://elektrostroy.kz/ckfinder/userfiles/files/88817962963.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/riwegepokelazemel.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/2745596125.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6f452e10---nusurup.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/22590197225.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deca28e762---44267681643.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/72199676936.pdfIn PDF document text
    • http://idroter.org/userfiles/files/99419781402.pdfIn PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • http://hakanhurdacilik.com/userfiles/file/xizemugak.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/81347518174.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_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 10524 bytes
SHA-256: 080e6345c4bea5522634f28951e10222f49d4d29aa5352e15d7ec6969762126a
font_02_sfnt_off00013615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13615 17916 bytes
SHA-256: 06402c3085d8cf78aa651bec08b3bc57e4d619ef431874603355d0d33fe6f895

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