Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cff092877d7222…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 12:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13cc763ad04e4d1a8a80d5a01a8eacac SHA-1: 9674f854b17ef1bffab8ce62c0468accb0d24a29 SHA-256: 78cff092877d72225716139d31c8905bc98539b5c1e378ac18fc75c988ec386c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple external URIs pointing to various domains, some of which are hosted on disposable or compromised platforms. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=hard+reset+sony+xperia+m PDF link annotation
    • http://terhautz.com/upload_files/files/fazulexes.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/83323678469.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/temaramedajukokefasesu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613029a8ae45f---mokezuzokamol.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210908_064958.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/16609835509.pdfIn PDF document text
    • http://kme-kme.cz/files/file/jiluxovadivegoxulugebat.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/qh5s3ala7ga11sevurcsn6lvlc/70171413989.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/ninamujemafadezarazob.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/xibexoxamowogog.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/15588413375.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/folitulegelijowirade.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131765b7c9db---bevikebixikimijiwek.pdfIn PDF document text
    • http://zzquansu.cn/d/files/99604032348.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/82856387074.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/57189075570.pdfIn PDF document text
    • https://buyafranchise.org/files/files/sowakinarovewututuk.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/pexajeponibiposubukurufam.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodemerolixovumotuzib.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/21989507439.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/74028093820.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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 10716 bytes
SHA-256: 9e317826481b53eca5be8b234b3efda5d56a8a03769d0c189a05e26e6b39698d
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 18808 bytes
SHA-256: ded7a5fd32da5f96c571da623bd3a745797c311352ff58888476837030b175d4
font_02_sfnt_off0001201c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1