Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05ba87e1b8bb14d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 20:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 807c156939afe8d19897dbfd18b4b320 SHA-1: 2b9aaa08640db0d1600ce6ae08249ca5b58fd756 SHA-256: e05ba87e1b8bb14dd367a9658b7a3734a82532bb8f5d38a205be0d03aaa01f17
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing campaign aiming to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=copy+all+apps+from+android+to+android PDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130690eab4be---fazolorewi.pdfIn PDF document text
    • http://hkalc.com/userfiles/bilibivab.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/rupezorumegalikujiziwuwu.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/ralagokakime.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/29956856064.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/bivebeniriv.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109101449481748.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/dikawako.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/mekebuwaja.pdfIn PDF document text
    • http://ellev.fr/upload/files/silaketagifix.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/kowizidagexigidikubonef.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/narotobamig.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/gixuxozozobebumif.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e69fc7e61---94824799731.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f82c06878e---94164797969.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b09bdf37c---41760266897.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/57321960336.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/tumud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141107697f7f---sujalerewevatazum.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/tunaputosadagasusubajez.pdfIn PDF document text
    • http://sentai.cc/data/file/20210916_034320_145.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/beromudesenurezodusademad.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/kodamaxabulikem.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/laroruk.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_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 10672 bytes
SHA-256: 2f5d6406ba563f2fcdbbaa04106f0455ddba9fa92f925ed9de6bffedee200c91
font_01_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 16708 bytes
SHA-256: e98e1bfb53a59062ab21253b99bf8ffb5225eaddf494a845e9f80943a06b4941
font_02_sfnt_off00012827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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