Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b90ba06910a007…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 19:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 381f8e3797afce9afc95779aa76b709d SHA-1: 4f15b2dfe9fcdba76c72d2674e3a8152d2431e0c SHA-256: f3b90ba06910a007d7f787af2e0426427ddf1ec6e42132ecc60b2d9ba4f04136
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting. The heuristics indicate a link farm designed to redirect users, with one URI specifically pointing to a raw IP address. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=sample+letter+of+acknowledgement+of+acceptance PDF link annotation
    • https://marblobathware.ph/app/webroot/img/files/bofararal.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/pidazuz.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/wezen.pdfIn PDF document text
    • http://perksys.com/userfiles/file/manesodoli.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613976f31ce42---pixosavoredawuwirifuxa.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/36349751492.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/93518774668.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/35551515738.pdfIn PDF document text
    • http://electric-kernbichler.at/24108009816.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/lca004pcndkdkcev04ukjt3po6/sokezu.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/11586024377.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/bawupevoxusodegefukivozub.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352f153017b---kinubasoloroseximojirabi.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/22333833708.pdfIn PDF document text
    • http://wixoon.hu/upload/file/27130316675.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/dusuwajosex.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/326408952613f843850b5e.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/27056989654.pdfPDF link annotation
    • http://identik.hu/editor_up/tumebarav.pdfIn PDF document text
    • http://www.pilartangguh.com/file/kedotazoditumusigibomu.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/86264725194.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/ketisa.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nuxusilub.pdfIn PDF document text
    • http://turnyras.lt/Files/file/revabitef.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5dba6f9bd950a2f9f976a536da5f6c2d/bileposez.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_off0000d0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 10956 bytes
SHA-256: db72ce0b457f97dc36d3eb01757aa533d4c6627ef307ae6e6ab3382fe81062e1
font_02_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 16732 bytes
SHA-256: a78ed232db543203ecf9de39117437e04977308c0a24d93329cf095c4d426360

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