Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c352806f69816d7…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 05:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b7531baf23d043f9a439fc00cd6fce1 SHA-1: 140eec564ababe6133bdc998ad8e082bf30c59a1 SHA-256: 0c352806f69816d79e69cfa4f7728d539ffbf4df007bcd9db031cf927be5a7b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The file also exhibits characteristics of a link farm, with numerous external URLs pointing to compromised or disposable hosting, suggesting an attempt to manipulate search engine results or host phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://archism.ru/uplcv?utm_term=article+ranking+checker PDF link annotation
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xujalegotogetu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jhvunhqjnc4890v56sr5sfkn94/tabilemipulatexutamo.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lugufanufekorezipased.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f49cbc931---mazuka.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210910170629126.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/dikadilezubu.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/mufugulasejaworux.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/33037099818.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210907215754.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/tebufeditu.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/fofukigi.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/24248864594.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a3de572d75b5a807234d8a5d0afda74b/lelolasotinope.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd06476f0---71824616910.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u6k156vo37d4qupmfur3nihp20/88686189123.pdfIn PDF document text
    • http://elitk.ru/_files/53461649073.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/69392952734.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210903080528_027eki.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/gidawaxowufukox.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/sewexovejafasosusavado.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/fuzivezu.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/61913199410.pdfIn PDF document text
    • http://hocomesun.com/upload/85280372814.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_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 10296 bytes
SHA-256: 0075bf9309b6d8a4656d90864f27393976f5fb58a6d83c970c0a4d2b0bd76d54
font_01_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 17360 bytes
SHA-256: a638ef37d7f25532d78d77d902ee5ac07000fc46729fe70af73cc2e4f8fafc8a

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