Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d92f7157b4e5cbf…

MALICIOUS

PDF

69.6 KB Created: 2021-09-22 19:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ced7f994f8ed1d9dc5dd753b724e7dfa SHA-1: a3b00f13e5ebf4fc33fe1aca5d98021ffaa39713 SHA-256: 7d92f7157b4e5cbfd1eb9d315d805e03df53699326bc304ebdf4ce39f334d5a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to potentially malicious websites. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggest a tactic of using compromised or disposable hosting for these links. ClamAV detection confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=manual+acls+2020+pdf PDF link annotation
    • http://uralcomservis.ru/crn_fls/crn_files/42354691545.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/98422866483.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/fitibozedilujofiguvoge.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/23272804497.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/lokuzesejavolofadini.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/5038491213.pdfIn PDF document text
    • https://menu2uplus.com/images/file/79264043977.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3608b8485---xelomumiwurorovewara.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2fc436eefdb663b47b553dc15d73e393/87422999162.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/16205109033.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144246e7d591---vatogizujona.pdfIn PDF document text
    • https://mmtours.si/uploads/zigewaliwuzufuvotudum.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/sagage.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210903043048.pdfIn PDF document text
    • https://red-adlay.com/upload/files/18766706465.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/jesavazigopoxuxosakab.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59a12a15c---tudif.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/49397493609.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/33461373981.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/85308588307.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/37240231393.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/pukedixalogijebumig.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-6/20210906145707271618.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_off0000b524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3B 10408 bytes
SHA-256: 710c01365f248f73d80b81f6a5a2a863132948a0553fe183bdfbddb2d46464a2
font_02_sfnt_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 14504 bytes
SHA-256: d92adc647535f877a289bf10c7e0b98b434773cf45f044af75b292d3fac7c0f7

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