Malicious PDF — malware analysis report

Static analysis result for SHA-256 73be939870509e9f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 16:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7fd7ee91e85ba68891193272679d78b SHA-1: 97288b3a1a7ab8a4721434d040b760f4f6786dda SHA-256: 73be939870509e9f2a88da21a8eb0b192f55b9e0816e258846a15e70c30cc2dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://muacash.com/webroot/img/files/80697769122.pdf In PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/bixikukevolejoru.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6ae3abd0---kosujafegotinozovekego.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614860d23adb3---zofebatebima.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/baruzasitajaruxotu.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///tepemeril.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/38208660668.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/bivaketedevi.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1bcd9db76---baputorizojaxeno.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/lojowevu.pdfIn PDF document text
    • http://jfe.hk/userfiles/zobujoge.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/varakuki.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/negexodivi.pdfIn PDF document text
    • http://fitviewer.de/files/file/kasaseliredolinexigalam.pdfIn PDF document text
    • https://pixel.bg/img/file/65972915028.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/71292559307.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/15599773491.pdfIn PDF document text
    • http://tai-group.com/upload/files/tobojeligoxaj.pdfIn PDF document text
    • http://orderkai.com/uploads/files/janokubutipobafininisali.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/40135934829.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/buwevirisufo.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/51251264326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+move+games+to+my+sd+cardPDF 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_off0000aedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDF 10820 bytes
SHA-256: 9199a7a3ae1e76194da40d0d6fb4915a6dbd24efe998ef1759e16d89df96f6f7
font_01_sfnt_off0000c7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 16600 bytes
SHA-256: 78169b3bdf409353d7f55597786770a6f10bd6afe288bad7e33fc9a9c8cbfdad

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