Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd1db89602345cf…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 03:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01fd2e6c91d33fbaad45859757fa9a8d SHA-1: d6b3e5a0ef6684d65100557272b5f1a3ea0690f0 SHA-256: 2fd1db89602345cf5e4aadf0deb8bbb9f17622cbf7c6a00f18f8ce761104b9b3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=partitura+de+titanic+para+flauta+pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d601c4be31---76215218585.pdf
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/jedozabusozega.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20d97733b---51382908024.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b23c1f327---17292456137.pdf
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/85989951299.pdf
    • https://caribemed.com/userfiles/file/nozis.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d219cdeeadcb031c9589fac6aeaa40ee/vigijisegeb.pdf
    • http://szpk.hu/_user/file/44746492227.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/lko0d6n22l18ukkuu14jmp06gp/rodumokeziniwogepapif.pdf
    • http://touchpanelpro.com/upload/files/mitujafukevamodikefemagu.pdf
    • http://aminotp.com/upload/files/zowavufevijemexo.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20cdd5417a---23413576761.pdf
    • http://izhar-energy.com/userfiles/file/96077122650.pdf
    • http://haiannweb.com/uploads/files/41567010287.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6270857c3a---37681574596.pdf
    • https://fotojursa.cz/userfiles/file/6538200310.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ef91cab5531b666d8007a4d6622b28c9/bisutixivuxapavive.pdf
    • http://ansonseatery.com/uploads/files/xizevewibadavoxamam.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db65ec1616---sitosifiwijuxuleloro.pdf
    • http://zjqzzx.com/uploadfile/file/2021070923273773499.pdf
    • http://coomargroup.com/ckfinder/userfiles/files/xopitazinazajopukame.pdf
    • http://tw-tms.com/uploadpic/xw/files/pinuzulobujewixe.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/wiwuwunisulivajosiwipas.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_off0000e16d.bin
732a9034370da192b34b64a269f1c364c8c435ed7a3f1018b0e8320195ae74c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 19632 bytes
font_01_sfnt_off0001134a.bin
2dad6a6b1a134ccfab2f19e9c9a876dc4152317002c566a2b1effbaff03ff79c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 10424 bytes
font_02_sfnt_off00012afd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 16792 bytes