Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57e28f8b0935bc6…

MALICIOUS

PDF

83.6 KB Created: 2021-06-27 11:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39ec2223ed355f03914d9d535f36e222 SHA-1: 9beed203e49a7e517404797fdd72fc63991fc72f SHA-256: d57e28f8b0935bc6ec4ab3eb3a6bdea7791fac8bf8015bbc28354ec0fc9d5ffd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, with many URLs hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e54a34c90---19358834504.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085058795e14---75179186050.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/j0ksra6a7ba8qak1e2uh221n61/41985733784.pdf
    • http://zhengfutz.com/v15/Upload/file/2021618238296035.pdf
    • http://fantalife.nl/userfiles/file/vupasaxolewele.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ce9eecb52d3ad055b8533cbd051798c3/fagizitekedilebexaka.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d4e0ee44c6637f69712697a550fe365f/zojuniweku.pdf
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/32883958362.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e25befe5---dajurezuvugavuzevazuguw.pdf
    • https://preciseenergygroup.com/media/kesateledejavapifokimid.pdf
    • https://tedvandergulik.nl/userimages/file/69566751299.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874e5e43897---34008382370.pdf
    • https://et-auditing.com/userfiles/files/27814090098.pdf
    • https://narimasu-chintai.net/jcfiles/file/32663351443.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/r7d3at367aeeqpkio9s7nneau2/pugefipiwokidutatularo.pdf
    • http://muzeumostrowiec.pl/obrazy/file/diwujesewukot.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dea060a821---21010828918.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ae43b73bfb042bebc58f38566421f0d3/68749664194.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dc20c38b5---bifaralapevumudedix.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/12634056388.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15220cec18---45406169913.pdf
    • https://clickkedai.com/userfiles/file/44479782582.pdf
    • http://beiwendq.com//data/attachment/file/23393612275.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609034874c22c---17478315337.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=can+you+sell+the+cars+from+the+criminal+enterprise+pack
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 16792 bytes
font_01_sfnt_off0000f750.bin
b56de5d812a25479e5f27f5a9edd630a0f10250930f2108b92ccab95c10ece90
pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 17408 bytes
font_02_sfnt_off000124ec.bin
e41c9bda1542f8c6ac8f900ca220cc14e3525199bfd5c3c35980681216278ece
pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 11084 bytes