Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc334441d7bebc2…

MALICIOUS

PDF

111.2 KB Created: 2021-07-30 22:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac1659258caceb9bddc50781450b53bc SHA-1: 6c95a088d75bcc6ba311e805e5b8cfed706dba9c SHA-256: 9dc334441d7bebc2aefd51039154a26c8ce41e814bf7d97af7635cce52f101fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=division+de+la+fisica+para+su+estudio+cuadro+sinoptico PDF link annotation
    • http://apricomm.com/userData/board/file/64366316202.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/84923091334.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8d2d25c6---niwux.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/newazoze.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xosudabowezowafa.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/m32k7h4dfouluafeugp429n0j7/kakaxaf.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b8955842---dijedojupiloli.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/1939934700.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/t30kahpvetmdh96sl58omc0qcn/24019078533.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/vazevevotigugux.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962eb306f1e---36279538749.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e0e2c486---37926893085.pdfIn PDF document text
    • http://usagimatur.com/files/others/solipubulokevaj.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/29379758369.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8cd5a8d34---57711544169.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/p055ap4q64h5irvqui475201ob/zarog.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/48924638279.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160949c067dca6---61506171560.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096874608474---68043323268.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc7cd1c07---gepotuluxopopovuzojojeb.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/tarenakev.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/2198175061.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/zuvozuwowunodij.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c55d42b045---93410019222.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_off0001452c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452C 21360 bytes
SHA-256: 67f18f9290c47808893df9e05cb33b75227364b574bb71596737d158666eec75
font_01_sfnt_off00017b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19382 10780 bytes
SHA-256: 9184c0f8dbd9cf91698320546da5070c93ccff0192dd3be2537d6deb4c51e292

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