Malicious PDF — malware analysis report

Static analysis result for SHA-256 439b906a9f3e83b0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 13:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91f85a8012d1bfcb62d96aa32d971641 SHA-1: 971a62806f1031a4f0a9a5bc35a34965eb53fab5 SHA-256: 439b906a9f3e83b0f5d36999c6ef88f04480e70d324015d8f9cf802a9eae585a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to prompt the user to install malicious software or extensions. While no scripts were directly extracted, the presence of numerous external URLs, many hosted on compromised CMS upload directories, points towards a distribution mechanism for further payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/j9l0p4adritspad10thrue3j08/6990185202.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607163a89e09c---butelilivebatorakovukag.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9326a84f48---98693909729.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/36737470121.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a946e6f35---bitejimigexukumavuwesomof.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/30389a7322cecdb4ec85e73f8a6e9f65/66817382853.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/s6888i8k74cpdi3ronbqbse6su/38050855861.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/numedufejo.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/mejakiz.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1c9407cf3598864a9fb831fc1d11908a/jidezerale.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8fe7d615eda73a76d010b76e5183a6a6/dujimiwulotezowujikizob.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/24984899771.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0017686a83aa297b427ef7a86b665411/fixevogomuzo.pdfIn PDF document text
    • http://christopherdallo.com/file/83159341167.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/78219450539.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/99492670032.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/muxumezezun.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/fanekem.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/9513447901.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/zonovezofiwofilekit.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/wixofagotaki.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/68069029984.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/budefifurironi.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/jiwopedegi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160be84d469a9b---fokatibovazomej.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/dumekijew.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/25528745926.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/66271564971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=convert+docx+to+pdf+in+javascriptPDF 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_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 18088 bytes
SHA-256: f2ccb56baa37bdc9fdb805e1e80bcb99d30bc9de9f9c483354c8a0419d14f647
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 10896 bytes
SHA-256: c4b5bbaf3fb3c75961abf2054210586635842ff0d8bd21a0dfc84d17fe071985

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