Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f53b6ee5da88e3…

MALICIOUS

PDF

95.7 KB Created: 2021-09-18 23:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50c37b80d54c78b1310f1130a3ef48a5 SHA-1: e4d7fc5c8eca8bb4e2f63758967b6702aa8fbfb9 SHA-256: d6f53b6ee5da88e39fc2336002d54c7e9d727db1ea25f95ea311f0d472280ceb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=billie+and+emma+full+movie+free+watch PDF link annotation
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/861556858.pdfIn PDF document text
    • http://varvshistoriska.com/file/58569064898.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/fuvefutakir.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/56204881585.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/60689569754.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/xarivabaxudovasovoni.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/62445559970.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/62666171763.pdfIn PDF document text
    • http://adveotec.com/img/file/jojal.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/soloze.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/dopobobenosewirokekowim.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/34110686961.pdfIn PDF document text
    • https://profesa.net/userFilesfile/49296804638.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/lazaduku.pdfIn PDF document text
    • http://sivam.pl/files/file/3571583745.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/kusojasago.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/jedax.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/95402714716.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3e8fd3fbc128d617a9e1b10ef7449341/jutujilokotojigirido.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7d8145d9d29c4d64b6d1a1471810cdcc/bikivoj.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/jaxomamafubesazejevopup.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d42607432---mezumatado.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_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 10876 bytes
SHA-256: 78fbe78d288b0be9ec5731d7b0458b58c8c4a4f7c8c200919b3230619f0747db
font_01_sfnt_off00012bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC1 17860 bytes
SHA-256: d80f2973138b7c688f34e80aab56c82ae0c2c92456167b4f4612ca19b8fa34e1
font_02_sfnt_off0001596e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1