Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86ac8758b958000…

MALICIOUS

PDF

91.8 KB Created: 2021-06-25 15:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3344a114cad8d075308cf08dff9a31f SHA-1: 0dcf90a8f6d0ca6038725103a9d28b10e9b3ecc5 SHA-256: f86ac8758b9580000d68b27c207ce8cae55350c0dd7c3bc39a5f5d9fdb2d2073
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c8e049dbe5263892e1f03bdf60ed76a3/47405316994.pdf
    • http://bundoreh.com/fckeditor/files/file/37880427129.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0bd4e6a0c00f72fa99c11177ba3a41b0/19738555246.pdf
    • http://www.bash.cl/media/file/55309068299.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210604_E0D1A106535C1A97.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b07dc012c44---47962520338.pdf
    • https://asiquim.com/ckfinder/userfiles/files/81936679053.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/5baemrn6c0vau6e6ldcl3rbvro/5791570094.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa66641c2---4031857858.pdf
    • http://sgpeo.pl/users//file/35116501489.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/f9ind71318g71p7leeqnv8be19/towewitulove.pdf
    • https://33mobility.net/uploads/files/8615909695.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cfd6c9ab6---wulosu.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc3b5e61f---52194908379.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/29d08485a257eca08d46ac06d4c1225b/mibasemotabolenozumalus.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d66a492561b8d238ee02bb8b14c0005e/27163553088.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+balance+clutch+and+accelerator+on+hill
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee88.bin
482a1894bbdf172a454dce4b1ece5bd6b45f4c70e5962b5045dc648cabb5f7e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 10616 bytes
font_01_sfnt_off000106b4.bin
b7f0438ac01ee5e087ad97029a4418ce8c9b925058b1c1faf1bed66a074dcb2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 17188 bytes
font_02_sfnt_off00011e59.bin
1e74f8fee3265b0d3a988f2f72ddbf961aeca470dc3b9b68e518b5e85a834f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 17064 bytes
font_03_sfnt_off000149bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149BB 16792 bytes

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