Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8a43f3a62bbc93…

MALICIOUS

PDF

85.1 KB Created: 2021-08-13 08:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 48c652a3edff8c42dc7b1b39e8ef8155 SHA-1: fd8d491b22d73597512b0fc5f8fa904e9e4018ab SHA-256: 3c8a43f3a62bbc937d68da6b14f359339fa73117a33972015456eca922af0ffb
156 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. The heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit users by leading them to malicious URLs, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://sarljarry.fr/userfiles/file/fezujaloxeru.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11c4a4cd59---pisutava.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/72622387735.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/akskh6apuhloffaeuamtgs3bss/tumuvubemikarab.pdfIn PDF document text
    • http://teraval.cz/res/file/60222650168.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zibujaj.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/62054609999.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/cqpk6m6qra79bvhh9kh9pktc80/63398355583.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/35881197245.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/39930268119.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/rovapitelat.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/fudewuvasebegiv.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/basanemaxarojin.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/pakusovunomet.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/wowutikubovivununi.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/10519890930.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5faa4abda1ebbbf30e85afa0deedd537/natedukajikijuvopo.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/jupujejuwojiguzoramurek1624016989.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/45397977258.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/76581189884.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/66768164217.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d21ea10d109126250e3f4bd6e7d90ec9/donilerolebudofeso.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/toruzigimipuwirizu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074f977492bc---10230667462.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/idc7vs9tq0jd4apa3jotvkdlnu/13231995210.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160889cbf9e66e---sifimalavotut.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/75329174060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=demonstrative+pronouns+worksheet+with+answer+keyPDF 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_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 18292 bytes
SHA-256: 6a30aff2866548a4ddffbc8a0b8cae63e57627d402aad7b93ceba3785b9341d6
font_01_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 10928 bytes
SHA-256: b935d958292c76fb5039daaa02817fe2f01a90a8ab5d21ffc9021ced285e9877
font_02_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1