Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7c850fb87891a2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 15:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f41749b15c8d697dd6a420cd4db487d7 SHA-1: ee1daa5070e5044f4bec76057d08e0d35aae37e7 SHA-256: da7c850fb87891a2b67e60875f33044b95378fa9d58802cbcf4d618a6a41f121
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm pointing to disposable hosting or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lachina.cn/upload/file/puvipureb.pdf In PDF document text
    • http://kibbkw.com/uploads/files/xanun.pdfIn PDF document text
    • https://funke.be/data/file/76109188463.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/2926470004.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/joxazukesabitala.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/volesefu.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/zejaxajonilu.pdfIn PDF document text
    • http://hk-keber.de/images/file/ropirupuf.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202108312323125788.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///tapiliriduxiwikigo.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/ruxejev.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/2375657355.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/48513684889.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/33478136159.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347d1f7d0ec---73844927574.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614398004ea6f---nadatubukijisobixe.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/63823d4abf0b4742911c938daee60fa1/91271180846.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161414507164b0---91681610379.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/99873317515.pdfIn PDF document text
    • https://unosms.us/userfiles/file/tosiwedobozivesizu.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/59715473045.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/siminudenemoj.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/nejamoxavulaxinozem.pdfIn PDF document text
    • http://dd-eng.com/files/files/nabaturemipekon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=open+phone+memoryPDF 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_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 10088 bytes
SHA-256: 3964ebc2be2281f31f0cf7be1aec6b0c3b0706d1ccffcd04c557ba2f0ae0e3dc
font_01_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 17712 bytes
SHA-256: 327b1ee70c60182d70d5d8a76e5d5f905a8bb0acd95e26346b359586c1607079
font_02_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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