Malicious PDF — malware analysis report

Static analysis result for SHA-256 8262965f0db555af…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 00:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a2aafefba4cac8134f18e3771ccbc2e SHA-1: b771beedd805012ab7e1e53eff9cd9e61f3fade4 SHA-256: 8262965f0db555af054f4e38fa2d168b0506e32c0438c8e3cec7ecab78d424f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or SEO manipulation attack. The presence of multiple distinct hosts and the nature of the URLs suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=essential+grammar+in+use+4th+edition+pdf+espa%EF%BF%BDol PDF link annotation
    • http://www.lnk-creation.fr/upload/file/91948902937.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/1527808988.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/93863478756.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4aaf923c1---2169496735.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/84707681314.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf91e02ea69---pixolemosu.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/3580584618.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/rajililiberelokuboxudozov.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/zirawofosap.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a05dd581157ea79264c2286b120701ec/zefiwasobenumeso.pdfIn PDF document text
    • http://dongphat.net/upload/files/23835855866.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/93952801622.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/imaau58bcnm3qag6j93vrilu75/71107579105.pdfIn PDF document text
    • http://signaturecruise.com/js/ckfinder/userfiles/files/32945257945.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c568f9519f736dbaa2b0d620f5e575fe/80616257336.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa94be70548---zodolawurubipip.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a72229f0920fe58965c268977742cedc/68409887137.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/bapebukatubenekepe.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4bfb3a7ff---wasiwigem.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f84acb394---23616948210.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609004a580362---nurivufinaponowumazod.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00716aa44---92555207368.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_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 19468 bytes
SHA-256: a475f0356e8fe2b6de9d525be8f056d86467d445065d30c1ee1d2c396e26f0a7
font_01_sfnt_off0000ff5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11774 11280 bytes
SHA-256: 47ccabfa372f4beb67f19f206f9cbb406705b5794c37f13ffefd15de6c587b07

Open this report in the interactive analyzer, or submit your own file for analysis.