Malicious PDF — malware analysis report

Static analysis result for SHA-256 850d9f2f3f942177…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 03:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b620b51c858357f542cdff4e756fdcc7 SHA-1: 65f1b40749a7cd8032fbe393b0615c7521e49f35 SHA-256: 850d9f2f3f942177fc55cf5f76e0475940322c7e5ff5f758beec86fe9e1896a3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=anupam+typing+master+book+pdf+free+download PDF link annotation
    • http://gwhs79.com/clients/867100/File/53862353180.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/70215565074.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2192198d9---70724607225.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/kabafodurerizumuxavetijix.pdfIn PDF document text
    • http://ezibra.pl/upload//file/miraxezuzuxuzezezadefuvo.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/17212306083.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/wobugab.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607447a81e881---3015301164.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/71858874231.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/kidupubejufi.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/detifofabuberiw.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/7fba51bd6be50c7a298694bd785ace37/92055012894.pdfIn PDF document text
    • http://servmed.net/userfiles/file/61283591105.pdfIn PDF document text
    • https://nistd.in/userfiles/file/tomefumuxupigomu.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/14107179196.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/5046338409.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/gekukewolakiwusebilut.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3733e4575581966dbd73d7c2cbead3f5/zopepoxadobowowunovej.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/sl3r8goti4pceg14cnv9gjk9ah/pobivimowupalurid.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4dd9c60d7---12681097039.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/22733635415.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/ponubuxuj.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f416cec7f4789c7f78237bcd74ebf65d/56248240832.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf7aecc1f2---bejebope.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/229d83a9af672610b8519ea390b7a623/ripowifopixo.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_off0000ba0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0B 11356 bytes
SHA-256: 46163ef57f3d7ff8e830608799e4667b3237db5c6a2c3f8938ab77e5e423a79f
font_01_sfnt_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 18544 bytes
SHA-256: 367940a82f0f3fb41d9f4abc882b3bcee73ec524a4f980cc54b0985861b5d22d
font_02_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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