Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb762bbfe32a1f3…

MALICIOUS

PDF

78.4 KB Created: 2021-06-28 10:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b2ace43f9447b2fa612060553f72bdee SHA-1: 9a4c666be78dba12be7c0a2324181d256e283668 SHA-256: 1eb762bbfe32a1f37926b59ebfb6b5a67a438494550a3b369b136d5d32815429
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs suggest an attempt to lure users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd3623cad---57580841522.pdf In PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/f8acb359fdf432d388d6ce4bb40faeee/38772398779.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f224a6fc---momivizegepofepufaxaduk.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/18929c9594cd61f9227bd29e6f25ded8/90102049217.pdfIn PDF document text
    • https://digicpictures.com/downloads/53145953864.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0fnl67p4mjpuoh6v578vjfu153/zixof.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab84c4550b---13355593585.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/gabumezusefo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tn1nd92j0viala3mo7o2quos8j/72995562197.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4a99a612915ed6c8f6cb7ef823cdb5d3/78334399393.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2636d7df79fcb4f25083e14d44689cdb/pizopurezop.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6d3eafcef---kusedasenujole.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/namidetenun.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/jubex.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d00deeca36---26351000589.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/xixejefumofomojifuk.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0578102aa---nidegozapunadojezixobos.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/7488577445.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/takiloxubapurewuviwa.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b31f353f7---mojego.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210616163155.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/jofifovaxajutam.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08c1c50fbb---mukufizasakom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+book+of+rulership+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 10528 bytes
SHA-256: d70fb88c46dadacb635e0a8050595856fa4146497ab3975d18204f2554bb62bb
font_02_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 16584 bytes
SHA-256: 5eca71ddac2c1332f4b46184cc741a082084feaf21b7ea164df1b3ea153d67af

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