Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cbfaf57ef2131c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-19 00:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb7ff686e43ed39d99389be0417bcb41 SHA-1: 256b5b8258f0f737c7ed9248ae65b85273286f41 SHA-256: 77cbfaf57ef2131cb2d17740725a813dae04a58d17fc17452c451a7f599a9fad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abwingsbuffalo.com/uploads/files/7634020282.pdf In PDF document text
    • http://yongchengtech.com/uploads/files/202109121053449918.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613575dc90382---11061192488.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/98593389019.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/sawoleratipodavinonisu.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/weluzizewepas.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/lufowulukob.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/jumegegoneb.pdfIn PDF document text
    • https://cityface.cz/res/file/93111640675.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ca7e9fb26d2838bd27d81512327ec567/duwezukoruvusevuxikedivuw.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/87682610887.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/penivuparaguro.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/37948727983.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/22007982635.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0ef17f8b71ac31c0406edc4d16f6c2e0/wisuzixofitepiwuno.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/jedosugidaji.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5b5c507b---15872411146.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/43713093413.pdfIn PDF document text
    • https://subded.org/userfiles/file/buzonifurapavimin.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/xudekisuretinoruwod.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/71304413136.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/fopojegofokefedalive.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9e0ace5bfad958a03e71b08a7d6cfadc/19694447715.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcfb2a202e---25487641765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+apps+to+watch+live+tv+on+androidPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E3 10816 bytes
SHA-256: a59f473e0d19c8e40294f6ab937fe26aa6c58d3b7d3446d9dd261600a29bbb64
font_01_sfnt_off0000dbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 16308 bytes
SHA-256: 0edd60d1f7bd7931547d0cb2560d267a8bf9e4f35d94029a514e8acae4dc7857

Open this report in the interactive analyzer, or submit your own file for analysis.