Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdcfca861788b0d…

MALICIOUS

PDF

85.5 KB Created: 2021-08-03 06:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 54be7cfce07c8ade6f2f3f0e7457c7c1 SHA-1: ad7bd5d8c69ff1f0cd08e552cba8e0d756b6fc3a SHA-256: ecdcfca861788b0d04b8e905fa1a84a6bc355f6eabe184f98f6bcc4c2e3122e0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=fake+sms+sender+2019+apk+download PDF link annotation
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d71985ada---92183515896.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/76793406249.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-20/20210720170700783364.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/5dfecf32961f18f9757e9eb17b39c17b/bosoduge.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/rqpt0rk3mjeo1qcsmbepr3a1ki/wexeni.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c2bee5646f55d492a30eab8883f8d0c0/78500187451.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/017ad674d2d46267a75bf858b34de692/92346918489.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/burel.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/64138351947.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3f9af8e9---94077617377.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/365ea43f4c57084e7c4d0fc192a50313/lediz.pdfIn PDF document text
    • https://eternalbliss.net/file/59397087920.pdfIn PDF document text
    • https://kawanmto.org/contents//files/76731733932.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ae8222fa9---wusetetujijo.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/78043419465.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/28661948541.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f21e6810eb9e1c1122b3d775a6191c4e/62321769526.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/pajiwenuludaragol.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077218e15311---78713821770.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/41227125683.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b23203be640---gigoposowowodej.pdfIn PDF document text
    • https://davaocarrental.com/images/file/batule.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/72075769635.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 10980 bytes
SHA-256: 6f5cb6c6a6e45ad9ba6f8645e3196876e0c0833c5d0a1c80585a0fd5b32d788b
font_01_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 17216 bytes
SHA-256: 47a2e46d18cfd0c604b04f70f2b692b9f3f78fad9d9d2190c053b6e715dc5fe2
font_02_sfnt_off00013059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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