Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52eb07ad5f24b09…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 02:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5d6c55c643504bd6104d4074e7057cb5 SHA-1: 4d421904deb17b5a729cf03fc8592453f326ecf3 SHA-256: e52eb07ad5f24b094cb662bcbb1d38d6093f0725f54eb40600b5504598ffee46
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/91900096380.pdf In PDF document text
    • http://istvietnam.com/rich_editor/file/libekazozowuj.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/44915833311.pdfIn PDF document text
    • http://langyupharm.com/upload/files/bofunevinawejukefoketuku.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/ponug.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/jugipetabivopiva.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7g93h3d3442osa8h3q16u16n8c/kesaximevudopivalelugifa.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/42389153437.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/33839361261.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/81500997617.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_200946.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae2119c12---41045481784.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/2892404698.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/10952673331.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/dujagunifokebem.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/41131678368.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/48948064010.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394bdad70df---gunujelebugoniwewogud.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/58311031613.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/21452028858.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/98168289691.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a23eddca8---numit.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/gefivozusegiwotixifip.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/sasolatufalikibijolu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613035ac71bfc---natibefetezibanunegutol.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/20156706653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+manga+reading+apps+for+androidPDF 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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 17316 bytes
SHA-256: 4e5320d90017485b7e1ed083637e8a5a39733f97e399f5f918acaed41e8d885b
font_01_sfnt_off0001116a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 10848 bytes
SHA-256: 3235a07a26810467914ad3e5a6d8ad725fb1d67cdcdb4a6f44530a29d7f17e98
font_02_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1