Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ed8a1b030e237f…

MALICIOUS

PDF

68.5 KB Created: 2021-09-08 03:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8db3b19510515d051229e95f0fa53237 SHA-1: 8789a66351bcc42ccf07e5a8a2cafa787dbaad0f SHA-256: d7ed8a1b030e237fe8c19511bb15a2ebd311fec1580f792e5f264500906f1b12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=novastar+j6+manual PDF link annotation
    • https://salonrewards.ca/images/file/xijatejin.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/lefutizedojaven.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/21833935878.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/56912331885.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/wolodukipinifaperir.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/38273365357.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/43349252901.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/82206807782.pdfIn PDF document text
    • https://people11people.gr/uploads/File/lanusolojagibinagepamuki.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/90368219429.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/61213961669.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4bfda15dab44fe00a9ae41aefc92f341/piwubudibakixuwavexi.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/71394846532.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/ligediluvubumivogal.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/44976409402.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/00c254561e642bb1d743c98394cd45a4/98356476903.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160864a60a2764---96345818667.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/raguloxuxidazawulefas.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/77661057451.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/bamodi.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/95123004552.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/panetuxekefomos.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a024fe19977---vurelekuguxoxekododexira.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/74742131294.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_off0000af62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF62 14368 bytes
SHA-256: 8f24cc1d37f40a488b44b52a2850b301d29c83545a78944b981325a0f2b3430d
font_01_sfnt_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 10484 bytes
SHA-256: 6c8e7d537bfb6ba0081d5cee0be7ad42f9ca6e2cae815b59ccf04c8c1aaf9a1e