Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b18642c7a9c71e6…

MALICIOUS

PDF

86.0 KB Created: 2021-07-15 20:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0e377c988d4dcefd9b8e61cd5cc57022 SHA-1: 1a861ac43e0f285bb875a52c3e3ab4871904333e SHA-256: 5b18642c7a9c71e651faa478df79dbdb18b082f39712128b319d10b11bc38091
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or further malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://garglob.ru/uplcv?utm_term=guion+radiofonico+ejemplo PDF link annotation
    • http://splogservice.ru/content/file/80254148468.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/brbn8bj3m48bvhfbkf2mtpdd8f/24098596418.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mrk9qcv2u8rl1653tekc5tevg7/zipunive.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ad2r0iamcu6hsrhtqcsqgq9kq1/nedizexu.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607430e1eba47---zubomumul.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021789936429.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/lojuxixib.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/lirivobenopi.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ba28n2pp567oj913ek7h50qg22/zeduxoxawavoriramegemet.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/resugibi.pdfIn PDF document text
    • https://digireg.sk/upload/20248150014.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/pezojaxo.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/nefegotuwaponavosixasas.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/045c148339149d754d6b051feec85f62/sitapuwedemi.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/vifozugojub.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/494f0f6ff580117eb89931ff4c7299db/83374760034.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/77068068998.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b545d153d50---pevujepero.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160add397874d1---nuzudemodafopexug.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/zuvafetekex.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7752a49a79---53590166482.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/66138dac006ae76bb5f18e4ee2342ca4/99947972506.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/43823g6gfntl27k7auif1duqpo/43000473184.pdfIn PDF document text
    • 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_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 10784 bytes
SHA-256: 80f4f3324090660e321cff58a69dde38158981b937155945543132fb4a674a72
font_02_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 18388 bytes
SHA-256: 649a9cd2e9e2269bbd32cc806809a2d83af2c498d00ccc3d38f5fb0f6c4188a1

Open this report in the interactive analyzer, or submit your own file for analysis.