Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd61d40cdbb984f…

MALICIOUS

PDF

83.0 KB Created: 2021-07-22 05:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92e6f8eb9e1d1ca07b6c579da6de5a0a SHA-1: e1319cb9baf1c72f5b1bde7bb3ecb2e0aa42b17d SHA-256: 5bd61d40cdbb984fb9f7bea2d33fa4c2fc8676c13600dfd02967964c1df94c06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://diamond6ranch.com/userfiles/file/73661860181.pdf
    • http://petukmahaaaraj.com/userfiles/file/47526822652.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/81067267371.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be265ae900---64278627310.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/59973319843.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/14957d4850987b3bb96463062bf9dc4a/mosijadafojemewumuv.pdf
    • http://ahxxzx.com/userfiles/202105/file/85922691286.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/69d7bc80031754a208c2d548e05cb58d/tapobizunafal.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082a372d3bbf---fifoke.pdf
    • http://massiimo.com/piceditor/file/widepegone.pdf
    • http://vinhthuan.com/upload/files/wawidoxunubaniwutukemuw.pdf
    • http://huiking.cn/uploads/file/181058557597.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/131fbe4426edd7df9a4f55c48ce3d398/44664173735.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609cae7f424d3---3275266613.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/946def3983279d1c881d0de675e8f3b7/87430854791.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2d4c40022e0520e2c4aae308e3224d40/5429915849.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7e3c4b6d11fe7b9286c96ef551495c6d/zedozon.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081db4e94a31---bitikimanew.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c20c2d273d---makuduvezasipokaluputola.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b9ee1988---98138007803.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/30153491300.pdf
    • http://akcjonariusz.com/UserFiles/file/levixofux.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/49242748910.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a04379bc3afdd62c630a99774bc75a8d/58087594001.pdf
    • https://soechi.com/userfiles/file/maderenadim.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+ghost+and+the+darkness+putlocker
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f29f62b5a20e66a31ea4459ba32e7a15/72395284301.pdf
    • 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_off0000de5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 16792 bytes
font_01_sfnt_off0000f673.bin
db08ba3cb1d90a73bf1581359a3b6e4df08da963b01e0175a6437a6d93c56670
pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 10856 bytes
font_02_sfnt_off00010f53.bin
fd40b611f33fb67f1ff4bf45ff2ccaf34cbed13fe6922addaae0e3dda262f20c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 17372 bytes