Malicious PDF — malware analysis report

Static analysis result for SHA-256 03413e95025a3f5d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 20:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c59ebc06cdfeee4296d7c3064e38c26a SHA-1: 767b68935984069a0120deeb8ee9618c35477ff8 SHA-256: 03413e95025a3f5de8df35549380658d1bab217fd243850c01c7d0587323a477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ukrkarta.ua/fckeditor/userfiles/file/50067856677.pdf In PDF document text
    • http://siciny.eu/userfiles/file/radinal.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/gerenoramowuwepaxuz.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210919084411180.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/xowuwexewises.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161378960411fa---rojeselumuradumo.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/51082487404.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/pevidovoretoruf.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090608265970554.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/jukopaloxo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0636e7fdd---wawomupusofijinelitolezi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f0aa37e21f22cb90796f0a5ea1cdcac0/4201712162.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210910065455.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614254fb3817b---bofazijekofebetavofebeju.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/watiwofudevakapez.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/lorejajum.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/55113793272.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/20084329796.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/42865451799.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/xisuzavuwotowi.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/pazuvevadodezadudesasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fly+me+to+the+moon+jazz+piano+sheet+music+pdf+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE90 16532 bytes
SHA-256: f24111bd0360b7faf8eff1d9209e6fa22076a0cb4c3be7b8e8ab2b4e9d84074b
font_01_sfnt_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 11268 bytes
SHA-256: 463d1688ff83d0ee62702da6de506e01ede35e6b3a67bc8a590c73e9e8aa4dd5
font_02_sfnt_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1