Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfac822ae8b41a0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 18:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ee6707334b158f330d199dc22331f70 SHA-1: 5a2566077317dcde806976ef32eb7420b0265fa0 SHA-256: 1dfac822ae8b41a05f95fed83c96574bd99794d611dea8ffcce5fa1e26b00143
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the ultimate destination and evade detection. The presence of these links suggests an attempt to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088d80fdd3fb---51463327853.pdf In PDF document text
    • http://marcth.pl/media/fck/file/85469469863.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fb275c6d---86940628151.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7178ee8f7---60337449419.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/xavikipenox.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/fbf6bob0n2j01piv1pbsei4p8m/pisexewafemerokege.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2a283187e---paxusajarozute.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/xorumugefijagegibuzisadi.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/guzeseropamogimivo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3i76aho5kod487eoukijoqehli/20788405619.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/mutenataz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6cf0176d---bazimiwu.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/86448218949.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/a90cb392a6face93d5da292bfb8ad55e/25952592400.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb0de30ad---vuwexenitosupadejajuv.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210715_928B929EDE5119F6.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/20269659406.pdfIn PDF document text
    • https://kede.org/userfiles/file/36366727167.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e243340393---menokajusirejegixo.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/kugotilanebigoxenomezi.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/41275952403.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/nozaruxivajodexufex.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///divuwelutapefur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=baofeng+bf+888s+manualPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6A 10768 bytes
SHA-256: 7a794f8435e5b0feb8e77d4ca097cce2f957f69156a8389d227fdc89f039ce87
font_01_sfnt_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 21568 bytes
SHA-256: 0f38a9e997ac05e89a8aad61775f426569be42fbc3b1ca7e7dc4e213d32ee501
font_03_sfnt_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 16152 bytes
SHA-256: 0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838
font_04_sfnt_off0001389e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a

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