Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cfe828717d4617…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 04:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ba71a604ccba678e1b4dd9525295b7f SHA-1: 3730cce7bd9ef13ebf3bb39faf5b8014c92fa202 SHA-256: 89cfe828717d46175b4608f973d8095895ab1b8fbe980cdf8b46a5fa97f59c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 6

  • 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.
  • 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://azstorestudio.com/uploads/files/posevofosibebu.pdf In PDF document text
    • http://veitali.com/upload/files/25346821754.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210905015103.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/bimexevexepi.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/tubumeraveguvukoku.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/kuxovulugigegud.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/40568841306.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/pelanoz.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161345f4a09414---fogilenodumutazi.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/wominovazoratikabedesumi.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/87608827375.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/bazumikepejez.pdfIn PDF document text
    • http://cwesp.biz/upload/file/80948305824.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/falijuvazuwogune.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210906095718.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/gobibudemadobivifuru.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/93hqv1lj72n2t0ej7tnl2ciuu4/15425303776.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f2002d9396934ff82d461b30287c5b7f/28129324687.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/43035652875.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/voxilufibafuwev.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318397072d8---8055406980.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/64003500594.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/93759479525.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jixetolizenerunitemowo.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/02/file/20210902_072343_100.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/bukasujamigekawuzuj.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/lenizezanezul.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/rezibirerexosuvuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=font+not+embeddedPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 18320 bytes
SHA-256: 5a44cca65b62a4c74a8eee0f01139464ed44f220e12956959ab3631df4c1c477
font_02_sfnt_off0001154a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 9960 bytes
SHA-256: 3000067dfce183cc4691786add6e1c00ecfa66cf354d48d33ff0f641d3aa28a5

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