Malicious PDF — malware analysis report

Static analysis result for SHA-256 b139fd297dd15c6b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 02:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3ec383f392b64b360e3ff32a02297452 SHA-1: ce2684f16968ffdf2e785445c5e6fc63a1d42c3b SHA-256: b139fd297dd15c6be52b637f3e70f73931d1eb2f614ba69ff0e6f5e8ac4c8b78
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to potential exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://infrive.ru/uplcv?utm_term=watch+avatar+season+1+episode+1 PDF link annotation
    • http://xn--o79av69abka850ab6c.com/upload/file/202109070059489531.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/70795931783.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/vunuwibomepuj.pdfIn PDF document text
    • http://stefani.cz/fck/file/labilizatikidabuwudadosup.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jezebotedunixesovuwiba.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/lotajuno.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/79737398987.pdfIn macro / runtime command snippet
    • https://subded.org/userfiles/file/tadosap.pdfIn macro / runtime command snippet
    • http://inwama4.vn/webroot/img/files/29204513749.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/96382316817.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/pukisuz.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/latevidibukisip.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/12261368202.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/67016989361.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/39386195539.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/26374b5fea9cf4cb7e405be4f03fb2c2/54602393978.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/gagosabubonojon.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614da97cf2a0f---jijunanibelejiximox.pdfIn PDF document text
    • https://petala.gr/userfiles/file/7389868309.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/c9vh11slamjqqlfri9ihclcp8b/xeturojebagaz.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/jifusojob.pdfIn PDF document text
    • http://annabarons.com/files/files/wifofozowizod.pdfIn PDF document text
    • http://195exim.com/datas/files/loxekatabi.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/vudasudovep.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_off0000afeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEB 17640 bytes
SHA-256: b93be71e2051cbc48bbe5ff7c66cc33d3082ee7b0e28c4bd2ad8ab4654955af3
font_01_sfnt_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 10676 bytes
SHA-256: 1524df57e5c38607db16038bdb193277ca990b161d9df3a3dead4ea901c1a5b7
font_02_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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