Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90134a615641991…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 03:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 756337b43c440de67a6bb54761b895af SHA-1: 874a8f88b08d188f75862162a8d4c5bf3ece1aef SHA-256: f90134a615641991b0d5103a55b8cff46d08052f2978e2c2a5789c9273a3532b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=speedball+game+android PDF link annotation
    • https://alexandrapanayotou.com/web/images/static/file/79564719087.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210909081442.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/navekevilisebonepafo.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/xugejosapokudovetovelozow.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/99a3659903d8ab2ba57f5bcd0ef67364/bebaxufo.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/mifupesixi.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/wotazabulotijuwatu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130544b32709---5309161228.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/2030635737.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/9288297021.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780f654bd3---16432739258.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/43978072651.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/tokuwamutixe.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/98223945313.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/putetipixarabuxov.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c67d6f320---59070800582.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c84610152c55308f998f0f1a3a3652f6/bulokusasofajujukekinero.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210915142152_wfz6uo.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/55423356337.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/wasutimodekezedotani.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/reradabanavig.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/76967351930.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/39p5vahug7pgti068r6ti9cft6/tufufun.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_off0000ce43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 17780 bytes
SHA-256: fa59992cee9a71fdc9fbd74bd481ec15ec0de98e693121aa33e488188eef36bb
font_01_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 10684 bytes
SHA-256: eb5aa88f9d58834286ce0eabc8ea7e670f9a2b111e6db09f00d8bd95af543a09
font_02_sfnt_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1