Malicious PDF — malware analysis report

Static analysis result for SHA-256 136903b21447bb07…

MALICIOUS

PDF

86.2 KB Created: 2021-09-20 08:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07f03ce2ec1aca655061a66d1e759872 SHA-1: 95603868831078085fdc052a04b7067802170f79 SHA-256: 136903b21447bb077e2ab297de4788ad31802bdef8ed0714a94f5799592ecd18
192 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The presence of a QR code lure and a download button further indicates a social engineering tactic to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ingatlanfelugyelet.hu/uploads/file/dawonijozifowejewiz.pdf In PDF document text
    • http://studiotecniconuti.it/userfiles/files/gatovit.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/finifepulefetofinobam.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/xuxamoroxopamutuwaburodag.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/judujevanitakor.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c637050ab---wunanibepupanofuf.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/43f4c7e06f3d255bf46d20d758d0f9c6/60365360473.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/35757609378.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613682a70d7c7---3953224960.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/24611276693.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/63792215478.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16147ea3ae47f8---10519662996.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/o6461f08tg14bml09nkep1fpe3/28267636820.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/7961892191.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/67949785195.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/54150369536.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/2586578618.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/013808136dbde9609bf81b4bfca51a66/88828002144.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/59807535397.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/suwixikejenugolaviwiwod.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/75850914703.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/vemeguragapejer.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/92193020467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=root+my+phone+nowPDF 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_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 17280 bytes
SHA-256: dd4e57bb3f52ba13d3ffde98460fa7100281f37d0d895c7d8fb92b5644917607
font_01_sfnt_off00011c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C91 10196 bytes
SHA-256: b958b0adba684e33c2e0001a3d6f8a5e8c83d9f44f7c43bdd7015d365c460123
font_02_sfnt_off00013354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1