Malicious PDF — malware analysis report

Static analysis result for SHA-256 969234f8559e172a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-24 09:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e803918aec6bf937f93f5035bfc5a04 SHA-1: 5cb3a5c33207823eb3bcb96e9cb96e7aa7eb4934 SHA-256: 969234f8559e172a2be55defbcb0b262c541c8b3617ac66ac8bd4cebc439c070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised upload storage, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF's structure is designed to host and redirect to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=abcs+of+death+full+movie+free PDF link annotation
    • http://jurabos.nl/include/editor/file/13959950497.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/44535872189.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/25701751107.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/64680934619.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142091c115db---lavifatitimebaz.pdfIn PDF document text
    • https://quizai.com/uploads/files/vilifabisu.pdfIn PDF document text
    • http://ds-dq.com/uploadfile/1632186525.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/kuboduwepetekako.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/30093578933.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/xogapamigosujuduro.pdfIn PDF document text
    • http://vaithun.net/upload/files/42682193194.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/53747728282.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6d8e6db298d87a8fd00b52a179052844/zeluresaz.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/zilewunarakorifatozepomov.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109200822316987.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/49183474442.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/navomuxudazefabaf.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/95499299613.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/58901652862.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435bd4cda51---movelabuw.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/73045532214.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/mekuxitik.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/82021865467.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5afa9e8b95a0e6dc5682bae9531dedd8/11386381381.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/koruliwizimafakifiletu.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_off0000d277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD277 19052 bytes
SHA-256: 29048b2bb3b8507c6bf7bff4081f2b74e16579e22131982ad44ea99498f9cdb2
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 10924 bytes
SHA-256: 872f74bdde68d53694fd8933c55866a7c2cf94f3f2a69edd8d570b106815924b

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