Malicious PDF — malware analysis report

Static analysis result for SHA-256 205322115a6f0c4f…

MALICIOUS

PDF

96.0 KB Created: 2021-07-22 10:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f48ffa0b1d372a5f08f64ca0e15e075f SHA-1: cc3a3b88828c53079f0784929b9fda8b545e3b1d SHA-256: 205322115a6f0c4fe9c9824d033229e46c6a20964eaa3a94999773c2e7f51505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://netpost.vn/upload/userfiles/files/90358499478.pdf In PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/gafexe.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/xopidamodubusuwasowi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096d528bcb36---96183990042.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ccb0b33bd7a96b366e3a518a5b40ef3d/bixozi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bd18016f7eb---kuwis.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/29940753352.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/pabimewexawo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aba3dd5630d---42339903702.pdfIn PDF document text
    • https://htchninc.com/d/files/dotitovabizosezirif.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/zafunob.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b04e230a---wugufejikiga.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/xevuzosusagidu.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/15354334236.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/eecaff8a1b45d2b6a383528d55cf9ed3/lawisapesa.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/nejivoseniduru.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce5cf9f20e---nofetazejabebexebuvoza.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/61578530982.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/6374b59655d3f4697336bf8729b6bf95/wikefepufavazovadoguj.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9821ca8a7a---jalozowizelisagilanegijab.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/dekalomabudoporujid.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d695ad6d4cb---vazalowiluwopiredanoro.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca082675f8---5209306915.pdfIn PDF document text
    • https://hgb.se/filer/file/94285581897.pdfIn PDF document text
    • http://voijin.com/userfiles/files/83969776513.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/25108052592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sociological+perspective+essay+pdfPDF 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_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 17800 bytes
SHA-256: f988e4be9740ed768db863f810185f5d9948b0460817e91262b516561fc9fed3
font_01_sfnt_off00014085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14085 10948 bytes
SHA-256: 92758a1d2b7fabc683bd0429d877388c4cd1910254cb81ed2ba110d4e62de1cf
font_02_sfnt_off000159e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1