Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e43e59df68a68f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-21 04:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51e22487eac2199e3575249481e56ab3 SHA-1: 1bb6759b1aeeaf7ec9f085529fce17d24ed131e7 SHA-256: 50e43e59df68a68f66b05891856c87cf1f95c6c287ba5517030f6e87e39d46a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of numerous links suggests an attempt to distribute phishing content or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://philabc.ru/uplcv?utm_term=intermediate+english+grammar+raymond+pdf PDF link annotation
    • https://hotelgaric.com/upload/datoteke/13174402293.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/kogamubaf.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/wutogifadazutawunoragodez.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/46afabee279f716e6b740ebf7fe54b3c/21697381604.pdfIn PDF document text
    • http://rabwork.com/media/file/turiranokeroje.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686063b620---7382521761.pdfIn PDF document text
    • http://vejwun.cz/images/72119315260.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/bewajoti.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/8f49rsq2u0o1r8snlpj31qpp71/56494300878.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/vimofoxewekor.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/lakolufulazepadiji.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/20568708962.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/tazigojeminuras.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613173464f6a9---kipoxuzi.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/farudugimuwemono.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a8da1c40a---42388549844.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///93677214453.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/pazuramasumamevufewipod.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613BD1203B2E3.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/38524703150.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/58259566042.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/wiwulexetawebim.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/88270792870.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/3d7086f4889b280e6f6d67b04ed87a5b/64499008326.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/31519921178.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210901173446.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee4600374---jetipefawob.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_off0000c283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC283 11008 bytes
SHA-256: b06b408c6da723de5754bc29803e1914a870b268990f65ff041defb11b347009
font_01_sfnt_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 20780 bytes
SHA-256: 0892089fdde1179e62a251d6f138c3b1441495dd82f6f55f3d79783f115b6052
font_02_sfnt_off000112ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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