Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f68785b7c075fd…

MALICIOUS

PDF

97.8 KB Created: 2021-09-07 03:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 411bf46824d633d7f0824c9ddfe7ffde SHA-1: 1bfb32ff889b40ea0959731fdaed3b7b8e776cfe SHA-256: 82f68785b7c075fd7c43a7efcf26b89095f3d4006d7531a2ea46b04b3dbe2570
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9705

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 http://poorclarescork.ie/images/kezomu.pdf In PDF document text
    • https://semangkabiji.com/contents/files/62036816390.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/jiritubikekesikivopu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a121848de6---86571188043.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/4d9gatrbue9gdchthampd4ns4n/31469368629.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/gizimawalegajaluwudabe.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/20f9fa351daed514484dbd2f881edfcb/dokixiruwijanagesomuzu.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/72518278706.pdfIn PDF document text
    • https://senfina.top/uploads/files/silanusefo.pdfIn PDF document text
    • http://centromp.it/userfiles/files/48029290457.pdfIn PDF document text
    • http://artospace.com/pics/file/93242023736.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/zomipiwawivobabekojabozu.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/xixunisikiwujenuda.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/basiririliwivenogidavefij.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/fixazuzasob.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/6d8cd49634e0700d1ba578af357ad25b/vurekoxexirega.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16076266f01e85---90848316536.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210813030611.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eda0c9dc5---reditaf.pdfIn PDF document text
    • http://sakem.org/userfiles/files/rowowerabavebusi.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/76094526491.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/tototefebobupigotis.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e5bea5cf3b560c737fcc6fb753fc14cd/20173128766.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///77531369464.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/dogaf.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/j5cqu6n5n0rkh1hfsv31fgps59/seratuxinib.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210823150749.pdfIn PDF document text
    • https://tsegypt.com/file/zuderaputefebigis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D8%B1%D9%88%D8%A7%D9%8A%D8%A7%D8%AA+%D8%A7%D9%86%D8%AC%D9%84%D9%8A%D8%B2%D9%8A%D8%A9+pdf+%D9%85%D8%AC%D8%A7%D9%86%D8%A7PDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000148a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x148A4 25796 bytes
SHA-256: 4b2d38c2a85598f99427235d8d8b78c97ce4faedcaf26b54f6a7875c196d5087
font_00_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 20996 bytes
SHA-256: 62fdd99701853f88f0d7af4db5fbdb168728fd2491ce0a59a4768df5a7a558c3
font_02_sfnt_off00012aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEF 18660 bytes
SHA-256: 1b5366745b3f97ad0ded5657e03e3ec1317333414985a73cea5fff36185472cc