Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f61a853eabcb44…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 06:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c746122f7a865f317bce1b52d0f3e8d SHA-1: c0cd69a3ff27a81dfe4dc1f4fa17af3d9fa16588 SHA-256: e2f61a853eabcb44eac96704ba8d0b950e217739370ce56f98df1ab268fde014
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting. These links likely serve as lures to download further malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/9954660882.pdf In PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/16789678486.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/76187159376.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/xumopavafodugamar.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/muropis.pdfIn PDF document text
    • https://digicpictures.com/downloads/vireni.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/vonux.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134de63f2f35---57560659188.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/46915719840.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/43429445555.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/tugilakejokikejofijiw.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161315a8fe1ad9---xativotifuzel.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/vunutoguwop.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/geramuji.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/74918420559.pdfIn PDF document text
    • http://wixoon.hu/upload/file/kilonixalofutimobivuzi.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/vawolexezosuvutorov.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa7f51999---3847430546.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/gavijorogavivogape.pdfIn PDF document text
    • http://c-amc.com/upload/files/niwofugukagibewapenib.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f315968f3---visuwolebamexeredine.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613af95540175---lagufosivekadufipa.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161358eafc2ca9---35157167774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+x+highly+compressed+downloadPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/gizekaraboxotuzaza.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_off0000b40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40F 15916 bytes
SHA-256: 5f2c784f35d924910ba68c17f9dbcbd2e8deaae642a65bad453f281768879119
font_01_sfnt_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 11256 bytes
SHA-256: 20209ae768c145e9b445da0a9e210712f750211dc23af435a7b6a6eb56354a5a

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