Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d709333c00e928a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 04:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a336cc802482a734db182c14c7b84c72 SHA-1: d63c95acb3c4e5ef664e2cc45ae856d6742fe3bc SHA-256: 8d709333c00e928a74c4e4eb8bd527e443209930738b953c512447a591532933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to various domains, including compromised CMS uploads and disposable hosting. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=az+screen+rec PDF link annotation
    • https://shidoremicrosys.com/media/42201710584.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/19016210812.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109050630274139.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///79595038363.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/6346132066.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/sixiduzaxet.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/26554573357.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/84877845380.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/82494906454.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144281b8f2d2---88929534127.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/35693253243.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614042731baa6---44950586209.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/jazuvo.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/71200664937.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/bbc4d62c9842537edf136fdc7fe4b49f/nidaserosasizixeru.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/gotinix.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/podoxulusadogupexiw.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/59341978044.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/34361959852.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/gejikuxawakegakov.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/dijimowajovelupi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d5859185cec7bf18031966798633721f/wegigupobasedewazidez.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/7549419120.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_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 18112 bytes
SHA-256: 668f2ef16933fb06756257a43bc46754fd8d043cb45fd47df9efbe7526284265
font_01_sfnt_off00011617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 9744 bytes
SHA-256: 315288b8f16634abb4538e36547db11af260d6d0f00f85c943dd109ed306e251