Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b97cd026f8f0be9…

MALICIOUS

PDF

85.2 KB Created: 2021-07-04 02:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2447bb7251c90b4e7f761418b74e417 SHA-1: 738bc21f7c465349c062fe41b3be912fb611f142 SHA-256: 2b97cd026f8f0be97a2dd99b6a0577411c997b7c590ca6c8301fe1a1d7ecf658
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a link farm hosted on multiple compromised websites, aiming to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the presence of numerous external links and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a workflow designed to lead the user to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+to+export+a+booklet+in+indesign PDF link annotation
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/4390156014b6eb3ae5a9adaf2e78c98a/72272875053.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e1e4837f---banowima.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/35a8e97c15c793986c34cec46deef336/81039538536.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c8b876152---39753471760.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/42632702999.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be815cb86d5---vatuwesopemomuwifugafanot.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3330bc5d1---59807003342.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kitesadunorubivolifabunon.pdfIn PDF document text
    • http://teraval.cz/res/file/widunatiwonajapufi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609747bb90fed---ruziwivonakijuduwo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/153f497d21bc15f7581951bf3f7b57a7/tadazifopidabisa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/supabexadig.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/9dd803c84b1841941b538e0236df62d7/xusatenosivajefena.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607057e1a1e28---luwowefaboze.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac2d65e25---vinorusopezerobew.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/82ffcd8c5fcc11608158cfbd4fe68811/59274010938.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/34622690869.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e6a6d0019---jexin.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/48300540237.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/k3cugk49m53mjps3s0cilciog9/7402696621.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852607061de---barodikotamawududej.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rqnmv8fp97aptk3ccq7l8epmb2/95298610060.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608061ab5ff35---73828097444.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/39203230804.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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 10976 bytes
SHA-256: d1440b49204a9f25eaeb491f048267b9270bdcd54ac637d1dc794e8ffbeb4a5d
font_01_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16448 bytes
SHA-256: 639165c5e57d6a00026eac02b2b522ebed2bfa2829a9da66d27e37aad92851a4

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