Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf5c47842bb578f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 04:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7150bb74409a0b0947f0584f20738360 SHA-1: cccd8bfaefcec8adcfa3c699a2ec191e0dfbf133 SHA-256: cbf5c47842bb578ff0ba11dd8e8bf1d10512cd4f1ff80ce7511245ff57f202ee
136 Risk Score

Malware Insights

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

The PDF document contains numerous links to external sites, many of which appear to be part of a link farm or hosted on compromised CMS platforms. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for social engineering attacks. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to trick the user into executing a malicious payload or granting unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://pixomot.ru/uplcv?utm_term=how+to+share+android+screen+to+mac PDF link annotation
    • http://chandigarhdatarecovery.com/files/file/17960428619.pdfIn PDF document text
    • http://dolonchem.com/upload/files/vunojajavazonedorumas.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/25791511463.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e69c058c4a70d132775f95f6a4874cbd/91874120666.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161401ea92d738---raxejuzokuze.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/gigunikelota.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/64497328645.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/93333380896.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa831fb95---kolovarexe.pdfIn PDF document text
    • https://actor-conseil.com/files/file/zutawodubot.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/nitipigusazivetadafudugev.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/xozawekuxivavajinixax.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/gezokidibopuzulagivagitig.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/wozebumagaranevode.pdfIn PDF document text
    • https://intersat.lv/files/file/30531129351.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/69664740062.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0e432840---62000995096.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fc25a271---ruzawegosidodaxar.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6b0af062dd368a528b5f84ec94c373cb/puxekuliz.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/84651248530.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/01e3dad0d6d6fe551af894024a74f93c/milisevosowuritit.pdfIn PDF document text
    • https://5uempat.com/contents/files/12026758138.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/64501565536.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/xuzarozoda.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_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 10668 bytes
SHA-256: c1f463a567b80d284123f8582e6759ab6c459d21592173de337dcd1b478e793b
font_02_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 18044 bytes
SHA-256: 08d150b4c565e946d3f7cf439d64d7332ec5feb590cc7d54044be7609fda5dcb