Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea103ab143bebda…

MALICIOUS

PDF

72.4 KB Created: 2021-09-11 12:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e971b32f8b9ce7e607cf12f7878a078d SHA-1: 3d14417e431ba79ea039aa26e0556eabbb06012d SHA-256: 9ea103ab143bebda6d9c8f11a12993fa7cecde62690256f5862f860f4d64b484
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to malicious content through a series of redirects and compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c66c9bc43682a5b275bf6a99ea7563ad/vudozok.pdf In PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/loxosep.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62d290443---91314780835.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/ripuvokala.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/98352659054.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/6902309176.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/rapatamenefagefiripomesij.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/daxuwigakul.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1523e5eb4---mapogituzowato.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109101415465217.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/kajisatew.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/67872140898.pdfIn PDF document text
    • http://tabletopad.com/images/file/baripetedupukebofugezotid.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/tufuxiv.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a0b1d91a---23179269708.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd4a3b8c2---91281657923.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/ginesowawuzuforeruwanur.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/75512459765.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/furugorov.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/1rcoh3dhdavk4e0n9adn88fg5b/bumemun.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd45b012dd---26201769699.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/27470620603.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/99739108402.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/96922684962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+view+hidden+files+on+android+sd+cardPDF 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_off0000b6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A1 17380 bytes
SHA-256: f22e6f6cd4c9ba8c737952d65caf2aa1cf88c6db0eaa418676ccd31e6d29972e
font_01_sfnt_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 10716 bytes
SHA-256: 293081f6c4f2f7752ad1e6efedc8e18fec1bc78c97c855f8018bed691e5f83da