Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e55a626f7199fa…

MALICIOUS

PDF

85.8 KB Created: 2021-07-09 12:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13b3b3cc42f6539afbff7a11d212d73b SHA-1: 658e6a07c43876472b5910c9ddce809c1ca73849 SHA-256: d5e55a626f7199fa4382742ebbbfa472eb1902c2508d3a409b27ce66876c5201
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress installations. These links are likely used to redirect users to malicious websites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=business+forecasting+wilson+keating+pdf PDF link annotation
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/000eaece66eee9e548d49f77211c09a4/zikeroweke.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef37a99f1e---wabegupuwonapawasitaz.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0d93f4b6---26361098131.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abe99cdaa6d---zopizinozutavuduxaguziw.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/2631947128.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e63a849def---28347600370.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/9tcsu7n5be9snvddhg1hlp2b66/15051187643.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b708c677ebf---81133670659.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/51517196917.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/lexigu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/67867223837.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/92178462182.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/039ba4bd4f00a7c3ed8495fa572a7441/bumekekomepaf.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4e4d9abc1---zomibovixowe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f67b95d019---29647446748.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97188bec2b---nozexeduvosav.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/71630758309.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/50861521287.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/49248772186.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/5769977361.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/31944139203.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/69352395474.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609520e1e2367---likavanogusekizezizawato.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/79825772555.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/77230798469.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_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 17836 bytes
SHA-256: f9fc5da64f8ee0cd5f86d93f64c4133f9600a8557808448c88cef9b41296a76d
font_02_sfnt_off00012f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F56 11128 bytes
SHA-256: 6c7cf86c357806762670515247269a7353a22068ce03a61dfb16c8ac6bf1036c