Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0740a3a1274e599…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 10:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62aa78ae68bfb564c0975867c4bb607d SHA-1: ec6fa07ac8ade0bf4c0ba29011ccd86a785a8429 SHA-256: e0740a3a1274e599aa67cee8381baf71c4fa3a8d6780d74339b047e9463502b7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of 'cmd' tokens in the document text suggests an attempt to execute commands, likely to download and execute a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=astro+a50+mixamp+manual PDF link annotation
    • http://rrbrentacars.com/files/others/niwuxavukuw.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/19627679941.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/bevivusib.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/92026691839.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/78868978612.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lilumugezafiwuvug.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/10896722532.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/bularifena.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0538b0beffea1a6d202071058b873e9a/11831584078.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jac0h45u2lbiupcmd39er2kft5/45432644075.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/52807116603.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/padexemenifofa.pdfIn macro / runtime command snippet
    • http://sllight.ru/design/img/upload/file/90722095483.pdfIn macro / runtime command snippet
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/aolf030lbrqkues9bc1of1bvag/nokinokefifedirop.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/u3idnjibdl2modcejs4oj1dmgi/65245342225.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/51667623532.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/fosudowud.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ede9c7c5---23219105260.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/3196543086.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/82467297267.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16091a12587ed9---xovavovagifosebamagutoti.pdfIn PDF document text
    • http://mousike.it/img_ins/files/nadosodurodabuvogalobipik.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vulen.pdfIn PDF document text
    • http://dolphinegypt.net/userfilIn macro / runtime command snippet
    • http://perfecturology.cafe24.com/upload/editor/imagefile/41460052592.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_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 10720 bytes
SHA-256: 50261df1ef5fcc9054b0abc29a782941c3602168c1f510930324796c57df2486
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 19112 bytes
SHA-256: 98039470360efecfea4ad361bfb6cc9c35b733f74b7ecade0bb7f4cd689b4717
font_02_sfnt_off00012c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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