Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9658872edcd0474…

MALICIOUS

PDF

78.5 KB Created: 2021-08-22 04:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0aac562eaf10de4e69ef135efd54cf1e SHA-1: d321a8f8a8bd347edb59b7d0fff1ed8c758eaf9b SHA-256: a9658872edcd0474d4dcb230701aa1346fbee57eef105fe64addef69b1b44ece
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=berliner+platz+4+neu+intensivtrainer+pdf PDF link annotation
    • http://avalon-essenzen.at/userfiles/file/senopovigonazejufewozew.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5db2740f9f745ba35f1399a99c45f869/90197187077.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/kininafolixunoxis.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4f18cbb8---tajesafoduwi.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/gategesaxijuxetatakufawim.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/sofixuverinifarufozumejo.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/90630856073.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/92111173285.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094105eca573---98045002947.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f46729283ea---96382536710.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/95300233532.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/pm5j918bsj42qsr2ni4s1t3btl/87574026419.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/gipuvidavowo.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/38291968507.pdfIn PDF document text
    • https://yellowstonewildlife.com/jugitupasadopidobulim.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/64586610035.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/40886415258.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/zavonebi.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/katimovo.pdfIn PDF document text
    • https://isleo.com/i_photos/file/furuwolewivalego.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/nuwupafakipili.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/44594786125.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_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 18940 bytes
SHA-256: ea7cb0a6431d9b7ffaefdfc8ec1be8fb227feb4bd336dc49b5f7ab70ef107cd8
font_01_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 10728 bytes
SHA-256: 7813f6e31fc4764dfaa2df9b651b049817f11889bb62391f4e65b2324837d36c