Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc196457f2db49f…

MALICIOUS

PDF

86.9 KB Created: 2021-08-17 22:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4dc1b0b27f63775fef96ab2178d3603c SHA-1: d1f8827107a0012e6bb98ac0c4905b0767452b1a SHA-256: 7cc196457f2db49f621ecfc277790afbd3b7bf559c69694833e246b812d5a0d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and compromised upload links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://jdrum-music.com/uploads/ckfiles/files/70032615240.pdf In PDF document text
    • http://vanguardhungary.hu/userfiles/file/bikiwiraxivazifexale.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/46222507807.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2d833d89d---31714140483.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2ee4f0b7ad9df99efec3a275121a5c13/gikigogole.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/65638649786.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/kifare.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5a5b6235d08dc622e7209a0f72bf4c2b/zulowiwatavef.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/874507bb093f7570795492f2663d0287/femuluforuzibetenefe.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c729dd3b1---nipikoja.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/20283948898.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/12921338734.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8cd4a5c949febb3417cf4c31af13044c/24738003403.pdfIn PDF document text
    • https://andrejc.si/files/file/xekebotemazojotope.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/91264280936.pdfIn PDF document text
    • http://riph.pl/userfiles/file/nodipozunafumogikoson.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/82636248192.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/99931708989.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/a071b428e6f62a0dcbfcec97c160d302/41023899369.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/mqdk1mledfddg9iq8v4n6rmea4/27134554359.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/vogerotapupofe.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c06925c1d7---kapiderugerudepavav.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/povagekojizewuledomogu.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/delupuderirowafus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=libro+de+ciencias+y+tecnologia+fisica+2+de+secundaria+2019+contestadoPDF 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_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 17648 bytes
SHA-256: 6ff9cf9a8b84abbe0dd948bffad88b35c238ddbd5d74aca7a12cc97b11de7d0d
font_01_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4E 11424 bytes
SHA-256: e12fb9395b3c74c9cb7535075b1592d4c1e933f94ec1db0d0dd8739a6e1a73ab