Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a7b3b6ee983f17…

MALICIOUS

PDF

91.9 KB Created: 2021-08-25 01:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ef2f1fbab43e040b25d5fa034ee30603 SHA-1: b7c9bc7d70a5f0b863d93b6b8e1c81e962d56d4b SHA-256: a4a7b3b6ee983f17886396ccefd12d361ae9845569a88e2a188e0e19aa461258
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mongolia-volkslift.com/uploads/files/67810997524.pdf In PDF document text
    • https://besteva.com/upload/files/bimusog.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1e884732---3061817373.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/16561619203.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/morekikaponimo.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/kilijofezuruvojipad.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/88718335978.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/3n37k3p9tfsv1hr7s58em9u6vu/24664801559.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/68762340712.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/21366927894.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/11211605128.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/aogp3i08g23tap1ls79of4lf72/derokafiriwesulajapig.pdfIn PDF document text
    • https://eslms.com/userfiles/file/muzobenufoju.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f0ca0f74aa5---gomosixanifuwin.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c611da8a5dd---babaturojedubije.pdfIn PDF document text
    • http://sam-global.info/files/file/laruka.pdfIn PDF document text
    • https://wittnebel.dk/file/80169775405.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/bojemaroxen.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7620f508857597012d739e1b8509b5a1/38693422232.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a8598aaea---kedunup.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/43642776355.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pq4qcirg2eo7l1j49f9ck0p24p/xoparosugumujilatuzirem.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb0c997cfb---sawiromixavenufawuzide.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/cce07c5cafd218dbc5138b00d4c74741/sebokidovolidupalemisusem.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9125c6264---51314477373.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110e93a1ad12.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=kinetic+energy+and+gravitational+potential+energy+worksheetPDF 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_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 11140 bytes
SHA-256: b0edb471d79d847ec5d7031d2dedb5eabd288f29e438f1af61ce90c6a7c97fff
font_01_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 16872 bytes
SHA-256: c61ac77a4aa57e9662fc8406c76991a4bcff81458900d065108a6359dedaba52
font_02_sfnt_off0001489e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1