Malicious PDF — malware analysis report

Static analysis result for SHA-256 734a1050d1f99c84…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 14:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99d2ba56ce0f307aeeaff121066c3a98 SHA-1: d347d8779777df4ff84b1ac311690d9468b6c3d3 SHA-256: 734a1050d1f99c8494d618572699419123893de8b8c49a6ebee69411478c1fe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=iptv+stream+url PDF link annotation
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131d33e4f0f0---13938107452.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/76794470104.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/jileto.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/33474400555.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/28762035559.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/67644436235.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd777ec0e---botovokibubamizuni.pdfIn PDF document text
    • https://bauarch.bg/files/14234592812.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/doderineligaseguwijigop.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/misakekubojez.pdfIn PDF document text
    • http://sunway.me/uploads/file/10115259349.pdfIn PDF document text
    • http://www.og2c.com/images/file/fagarija.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa0a4ed300---91703810946.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b8a65713e923aaa0cff0e4fd11ba8c00/25317753703.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/85171922601.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/regogevuvidade.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/86050249499.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/kimiv.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210904173038_pdinvk.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/kinunibaseji.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/rusuvalomudupimuzi.pdfIn PDF document text
    • http://schubert-hh.de/image/file/93659800153.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dipalezinu.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/jopapowovi.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/18284849711.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/aad53e282a9149e38aeed4833000256f/33034385015.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_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 18036 bytes
SHA-256: e2f018d2ecfd429b6ebca5d37e5db5278395bf4d2385dd92764204618b29e556
font_01_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 10212 bytes
SHA-256: f95d0f7abaa09111552f1bac04c84032033577603cc1f509d5bc759bad6750a6
font_02_sfnt_off0001250d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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