Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c6e582738f093a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-10 05:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e9b4afd114ed761677c5886db035ecc SHA-1: ae3ae950a417e421971e2aa9309285bb28b30948 SHA-256: 38c6e582738f093a4d76af65e5ee4729d1503c26ac74bde4c9b1cac81041efdf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also includes numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eminenceconstruction.ca/viking1/uploads/files/55743848173.pdf In PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613631c8ec877---97023126210.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/12027283472.pdfIn PDF document text
    • http://myredm.ru/uploads/file/68607652330.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/gesoreginifod.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613634a6a7fcf---pojatunaw.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/19175554317.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/vodupenufaf.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/pubati.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/lumujifobowariwawefenisal.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/xoguxugiguvib.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/16520692538.pdfIn PDF document text
    • https://tomas-music.com/contents/files/73228321965.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/94353686016.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/madifanuzedari.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/dopofifulojub.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161315b6572557---786479277.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/30896945214.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/82325336354.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/49031876914.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630755130.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/povudovenizifugabidefe.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/deputedat.pdfIn PDF document text
    • http://nemochem.cn/upload/files/mefojilurokivunanunugoku.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/9156319075.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/dimepibamixid.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/3930599044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=can+you+play+android+games+on+ps4PDF 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_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 18172 bytes
SHA-256: 86140d7f7cfa221b28cd7e5acfe1401c7bf4efe3ba2ac8a5036503b50ff0228d
font_02_sfnt_off00012f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 10960 bytes
SHA-256: f1cd4833531b53dac3b591af05b413432654b43d1c31eab8b71d3d2d0802fdd4

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