Malicious PDF — malware analysis report

Static analysis result for SHA-256 f016971ef5c579b1…

MALICIOUS

PDF

131.1 KB Created: 2021-09-11 14:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed27b6110c76ff06d8b0fdb7a51b8f81 SHA-1: fa50a38fc1b9220ebf660df1bae87279e2b4b5a3 SHA-256: f016971ef5c579b15266c89b0d6768477abe36287de4145d76344c4be57fbd70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://shiinamotors.com/js/upload/files/gagalimigib.pdf In PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/6f6f0e0fd2a9bcc28c8307804b25f6c0/47943551704.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/gedubarabuzutepelikezof.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/34573425627.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/bipumomutupuzubon.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1e78b8095---83469959171.pdfIn PDF document text
    • http://jawarakreasi.com/file/mebapalodubasugunuxus.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/kujararunake.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/50504242608.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/susupakuwa.pdfIn PDF document text
    • http://aven.su/userfiles/file/jasuv.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/fukisuxagogafiforedolisuf.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/84408038495.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/79426713646.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/gagasufojelepudilamoku.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/vojovepofiwapo.pdfIn PDF document text
    • http://novichiha.ru/pic/file/50177316221.pdfIn PDF document text
    • http://guowangcable.com/d/files/63967411043.pdfIn PDF document text
    • https://iword.de/userfiles/file/1033026988.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/368e1920b25a76d6fef0597102a9608f/57099325521.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdae2b3460---32676168078.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/wibavidakexiwobifisasuwop.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/1954883415.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/valadidomozimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=nouns+that+start+with+k+for+kindergartenPDF 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_off00019fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7E1 18016 bytes
SHA-256: 58d1b9b1bc0797c1d54574fc36edbf1b3b17cb50e7ea921c31ccc67c11e6489a
font_02_sfnt_off0001e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5B1 10844 bytes
SHA-256: 09efd40d3cb22730b5396bdd2431d7d2e4d7d37fd449c31d9ecd6f7ba2c8a8aa

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