Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb14ea157d71f936…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 11:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6bce6585e0568fa37f6df2741ceb6946 SHA-1: 5dc0b02a75dcc99b776c5a88dfabf81873f5e166 SHA-256: bb14ea157d71f9362e42ab1ff03650fa05d99e00256b06bd7dc1673e1d052588
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the document's role in redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://smidgel.ru/uplcv?utm_term=the+woodpecker+story PDF link annotation
    • http://ducthanhtam.com/uploads/userfiles/file/kipagezarifozobum.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/92765492312.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/witimovo.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/92162861623.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/80470315526.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/tafalojitamexeposiwawob.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613808715a894---wenezuzufifusegebut.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/23865932333.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/30179572605.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/56fa8ed9992fae4feedea790adaa7960/birejalu.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/38206041890.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/bazilizijixos.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dddaa7889---66227602121.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395caa42453---gelitelanidavolazomi.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df3575209c---50062859008.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/luzol.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zenemuzududun.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/mozulujoruwovu.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/pavofezupun.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/88298844942.pdfIn PDF document text
    • https://artgalery.ro/files/file/gijenegenapavomovedimu.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/25738111171.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/tadedimaxifelusov.pdfIn PDF document text
    • http://zenkatsu.dk/files/39808634307.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/64248081180.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_off0000b181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB181 14664 bytes
SHA-256: 2f14a871e0bbdb1b8a1ad1784efadee22f87ebaacf789dc98bb9aa51ed8e9d45
font_01_sfnt_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 10460 bytes
SHA-256: 47428c92094d9766c1ffbcc9db2e1f92a968082646cb8a41b6dc696a2d68e8cc

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