Malicious PDF — malware analysis report

Static analysis result for SHA-256 86958815a95cb150…

MALICIOUS

PDF

73.4 KB Created: 2021-09-30 13:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: faabc5aa120100966280a70413c17b89 SHA-1: ffc4656668ce5d13650768fe6a0ebc11e2abf0c9 SHA-256: 86958815a95cb150d136d2cc8009e6284fc3b8a0c7efedb32d7336bc21168b5f
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 compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish for information. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hoigolfbinhthuan.com/users/files/govupu.pdf In PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/4858812056.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614271173878e---31916718287.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/nitara.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/junawurorafodujid.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/mikebi.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147ec5d849eb---sozodirajamebegakuk.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/43652618811.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/52491657820.pdfIn PDF document text
    • http://edituj.cz/res/file/73360685043.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1360720fd---duxaroraralusujanesifigu.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210915161227_716951771.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/68199c28122bc8d25a241506f84945f3/tusemadamelupur.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/fusufimidunebiwajavod.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/21627491837.pdfIn PDF document text
    • https://luminex.pl/upload/file/63579242818.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/vivepivavolizinawul.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210912141559.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/robiraliwemufikekanox.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/zilalufu.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/nozimusafosogaruravime.pdfIn PDF document text
    • http://bebcardkw.com/ckeditor-ckfinder-integration/uploads/files/ponasexup.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/bigulowavegazixewedi.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/samosir.pdfIn PDF document text
    • http://apvn.info/userfiles/file/35004708617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+adoptable+storagePDF 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_off0000ba2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2C 10688 bytes
SHA-256: 42889c444edf7ac0efecf41b629aea068ab0d204a41831ec3d3ba704ab8fecd5
font_01_sfnt_off0000d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 17624 bytes
SHA-256: af8079acc32b22dd00ab3482ed2e0146b4ae5a6538fd58b7afad949e96eca742

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