Malicious PDF — malware analysis report

Static analysis result for SHA-256 d028123fbb3c3bc6…

MALICIOUS

PDF

98.8 KB Created: 2021-07-06 19:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a7e7ff436bb9707d4dd97b9c8d2ca9b3 SHA-1: 631f6a7c8eaa4bab9609d31132977c7048d3296e SHA-256: d028123fbb3c3bc6d2bab92c1873bf71d8cf0e756ea4af83b4aa5c11eae59afc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=science+museum+exhibitions PDF link annotation
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/slff9jqvu4plar098sn698593g/bavipumatogosanopirige.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/doregasileresukepegigali.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/8277500980.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0835c9d0---18475688889.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/34618035677.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/doxipizevatirugukagifixir.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/15074278537.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/tixowaraketekixukewa.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0db4fd45---xinimajuzi.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/pivuzodofuwodirariwe.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e2e55aea---nazakonofowobupokajeg.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///mirizes.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa7b1e4ac8---jaretipubizilapor.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/99954926154.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc433a4f7f---20726527978.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080db0f390c9---36740621465.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/pisum.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/66726098372.pdfIn PDF document text
    • https://arerp.kr/data/file///gifudavekenajulenevoxiwip.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ee0159fc7---13742988471.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wuwuxubutun.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sunokudoratizuja.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbabab50bc---90688354943.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982313118a0---pifugojabevemi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pbqiqt44t9jh4ldnur2u4ua3h0/37498596904.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_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F1 18312 bytes
SHA-256: d79c6e72d13675762fde170a3fceeb2771f8b2d14490203a1bb3d287a4749e01
font_02_sfnt_off000165b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B7 10604 bytes
SHA-256: 627e192ca154e264424a4043767903ddcb416da4e815f83ab2b000d81ce43061

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