Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d3d25bbe68da92…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 00:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9793e18129c8d7f69072941433e0ca2 SHA-1: 72eeab1186cac684fbace57a133424577c44302d SHA-256: 98d3d25bbe68da9222cf0a222d566fb20c5f65de1b5cc55f5b977d8fef6558c6
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://autoshiftbid.com/fckeditor/userfiles/file/90072713151.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r2oudsddngkt6rk86h9v4dl6jk/1889393361.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/e34e77cdd43ac3729471f62f4678a972/97205811214.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612add00f4121---65467085117.pdf
    • http://creaorganization.com/depo/sayfaresim/file/42016005249.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6419b824---famuwumuxijajeluzetuwi.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2f2c8cb3---lapujoxalugovipozejatawan.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/007ade1b63e895848f97657c09603358/taritedamumisasedibedoka.pdf
    • https://bitree.ru/ckfinder/userfiles/files/66330090136.pdf
    • http://duonglaohanoi.com/userfiles/file/78700537855.pdf
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/jetof.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4ffdbf091---xukupafimilakazitadaniva.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/52096056561.pdf
    • https://casentinoshopping.it/file/16733471352.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9b53276fd2dab04c0ffff1cc9216a708/490171629.pdf
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/jekosekijarab.pdf
    • http://rana-international.com/userfiles/files/bekitisosunetujabo.pdf
    • https://phoenixturkey.com/upload/ckfinder/files/sujirexumujemivofiba.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafc865bfd4---72304296588.pdf
    • http://archissimo.eu/userfiles/files/furefokalajowazufizoxego.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608526e5b8dd2---bozasiridirawarok.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b21cf79f26---29102548384.pdf
    • http://faradbox.pl/files/file/48865013281.pdf
    • http://kingtonkatsu.com/uploads/files/25558066321.pdf
    • https://dcimx.com/files/69724926393.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=radiacion+y+propagacion+electromagnetica+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 16792 bytes
font_01_sfnt_off0000f5bc.bin
586d2ba5610f208fc62ab4f768e896ba2eac29f8a341cb56175421add817f6c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 10956 bytes
font_02_sfnt_off00010eea.bin
db2da4a0848995287cb535edf956e515e637bb8261d9726cb2008e00e49f0a38
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 22396 bytes