Malicious PDF — malware analysis report

Static analysis result for SHA-256 1782194364fe16d4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 15:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 447552e82131e372367c3315c6d60c14 SHA-1: f72f0e904dcd0c6ab60d40f8f34f24e3382e58ff SHA-256: 1782194364fe16d4e086c4b685e764a3016b2b57b93f17ea779d1823c32b66e7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=install+android+sdk+windows PDF link annotation
    • http://batiment-tunisie.com/userfiles/file/82001493512.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140252e0303c---rezuwatozunesovabopev.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/gaxedamago.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qo1irestl6iv3n4dpi52k5elmo/sudebinanarakofemupe.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/88677249163.pdfIn PDF document text
    • https://htchninc.com/d/files/kesedilotawarubakebazut.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/97860642760.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/fatinejeju.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/47268083706.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613986cb872fe---mevexataz.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/sogoforu.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/64458514030.pdfIn PDF document text
    • http://kustari.net/userfiles/file/6225530413.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/35365066024.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614198c9abe2e---fazedezupapexotisawaxe.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/wulozububalosoki.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/76009750633.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61068468195.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/visogagi.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/kotamezifopuzazadekufu.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/wuwolajona.pdfIn PDF document text
    • https://qkon.ca/images/file/moguvutamofagofimo.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/zorenoxosazet.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/93s2knslg3n34klke0mh1epp85/bugikuwijuxuwevanixo.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/36200320076.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_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 10240 bytes
SHA-256: 149493ba3db2a8acec1bb7961797d03e47490418abf207a53e47c6fe6f3984ea
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 17604 bytes
SHA-256: 7e63c6a6a074068b60e1ed22d78a17cb1dfd5e6387072cfb325907a1c423b76f

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