Malicious PDF — malware analysis report

Static analysis result for SHA-256 61738885d1fcfd7a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 02:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d04133c73e167004f5e3decf384db23 SHA-1: d4e35437ad9bfefa75febd8b31e27005d6589945 SHA-256: 61738885d1fcfd7ad3d197bea23fa396405d6083925018126cd8095833f1605a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised websites and potentially disposable hosting, likely to trick users into downloading further malicious content. The presence of a 'download button' lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 http://crosswaysrecruitment.com/userfiles/file/kewuziworotabukinisog.pdf In PDF document text
    • http://austria-ex.com/images/blog/file/38806319456.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae96caec3---dukidob.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/96384193422.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/16376214337.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161351d87e5507---mifadadupobavonemaxexonox.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/jalelabewimujen.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210901215644574554443.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/vijezufanavovowefeziwab.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/51840409862.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/jebivos.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/79451335681.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/43531903417.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630699969.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/xuvojerew.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/10003653262.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/68656968797.pdfIn PDF document text
    • http://c-six.it/userfiles/files/62050374930.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/31061687657.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c3fcb91d---gonenu.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/716219096.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/barejutuki.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/1934240542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=telugu+latest+full+movie+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 10812 bytes
SHA-256: 851f77c56fbd2151051ea9e0e3fa090cb02e6509764579dfbac6e1cfba1b1891
font_01_sfnt_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D3 17792 bytes
SHA-256: 882e820b86809070ce3feeed3242fb636198a52634bc9d942431679c850c6662

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