Malicious PDF — malware analysis report

Static analysis result for SHA-256 590b41ddc2837e68…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 22:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14a44874dd139379a04daa6ee1e6bf72 SHA-1: d7a7a2d5a7cde3d33da24ee1c0bc807b1b10487b SHA-256: 590b41ddc2837e6843eb889f56fbc508e4a4eb79256416db501c935440e62bd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://huntic.ru/uplcv?utm_term=poco+x3+vs+xiaomi+redmi+note+8+pro PDF link annotation
    • http://www.anieliasfx.com/uploads/textareas/file/50115797418.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/maxinuvabebowikelogawuf.pdfIn PDF document text
    • https://cmoretv.com/userfiles/sarasib.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/xomokopasibuxowinod.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/rexixediw.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/28c337b123ceb746fa307f0d30087ac4/jezonaxeb.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/govabegilapuzal.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/voterufowuvitijelakebamix.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/v4g565unj1jof5274umjuc80c3/66669957823.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/93568085428.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090600045052.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/5592588828.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139406932b5a---28220032392.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/12701255720.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///ribepawovonawaxasuk.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/36825309373.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/89264490298.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/81302573267.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/66588708286.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/xekanotimiwafosasufikoka.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a5b42cad524f26c5b1fc1ab8fec91518/vumogo.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/18174890530.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/dojojomakozuka.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/dawazerigudepakunip.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/43024491750.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/84991157680.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_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 11176 bytes
SHA-256: 26f669469c7fa64253980a61809f24638fc7976ad2e0a433ee6da5948db308dc
font_01_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 19032 bytes
SHA-256: 92e7031734ea0de294231bb934d2865431c8fd103b57577d5af4ac1dfafc1f6e