Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a9da7b0ae7a613…

MALICIOUS

PDF

95.0 KB Created: 2021-08-07 16:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b322990a060af65c754a52b91bfe616b SHA-1: a3162401bfc3e6cc368934d113fa680a2886efb7 SHA-256: f1a9da7b0ae7a613de3900f6aa9fbe060f2c8fad1ea19e2c56e9b88c5215318c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/95vq97n47nss06ith3otd63al1/mupeju.pdf In PDF document text
    • http://gyobel.itpublic/file/10532148081.pdfIn PDF document text
    • http://ibb-online.ru/f/file/fugewejezamidofogezux.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/mawumivefuvogi.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/23193278745.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/kexefexuguvasiba.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/71478933794.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/80787098917.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7n54m0ovmgol9ersire0le5gk5/55532113969.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4090d0698---xupunumovekogimivezujosoj.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926282563f---bumuxa.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3c04c6af798c7ab390b410927d231eb9/13060389065.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/sekovusizilupenub.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/12948194876.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/tilawonorab.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/novewave.pdfIn PDF document text
    • http://veitali.com/upload/files/34215066811.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b485db2d2---74499211898.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160725ff617d11---xojenedepomudulaviw.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/89205596268.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/girumudulejaxo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f8ad8ce18---91617791928.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/71271376196.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/luxot.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-26/20210626005918624442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=convertir+chiffre+en+lettre+excel+sans+macroPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 20216 bytes
SHA-256: 99abec130f541ed1397595dcd3ba1fd70d5c34e3b7c480701844132d7d36d9e4
font_01_sfnt_off0001224e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 16996 bytes
SHA-256: 35f504b1668e38618ed0a84aa946361ca227fa63a3aab5e3a9a75237037148e2
font_02_sfnt_off00013acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000152e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E2 10800 bytes
SHA-256: 58207f063f4ef895cabe408932009b88a59f636d50cca93fdf8499b36e6078f2

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