Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb6fa41aa98e059…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 04:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a017ea967315ad39c514283095c67e2d SHA-1: ac6ce0c791b813bf1b7fffefe1ac771808efd978 SHA-256: cfb6fa41aa98e059facbda975948967939ee6099e71f59a5b04e8aff930c9c01
244 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of a second-stage payload via the embedded script and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 9

  • PRC/3D content in PDF high CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af07f47694---26897664056.pdf In PDF document text
    • https://davnosti.ru/upload/46123186238.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/2304357626.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/26508447228.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/39535760455.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0901/ea3b462ef6feafb6011aa5387a0079df.pdfIn PDF document text
    • http://enkepharma.com/upload/files/21694049066.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/firabedapokaturaraso.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/64300464979.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613341ed79c9d---sijugafosulasimesokujafa.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/8658838326.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/21819392836.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/84947722522.pdfIn PDF document text
    • http://soles2walk.com/data/file/79710531254.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/bukilikewokezebinupas.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161404f42207ba---27196809416.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4a5e4f3960eecf3a923d5ead2b7390b/86863572102.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f3297eb76ab625fc6d729910090f8b68/borataba.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/xavivolomikolaxipudiwoz.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/dimag.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/bobulotubajaloj.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/gidabodezolelod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=delphi+ios+14PDF 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_off0000b091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB091 18100 bytes
SHA-256: b4472265411e392127a8a66f0658ea1f89e016272a3fd11c941f3ea3602f16b0
font_01_sfnt_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 10016 bytes
SHA-256: d523bd11c965745ef09e8d567598b3d38d13140405f50ea8d1cfa2e1b3d8429e
font_02_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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