Malicious PDF — malware analysis report

Static analysis result for SHA-256 3544adfa31f34610…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 18:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9f2096f3c7622b1e02118fc783be245 SHA-1: 25d76168a7e35db3dee304b664dd32aa1ee36cc8 SHA-256: 3544adfa31f346109ff07a45fd32ecad75f02608300ccb1e8022106050017136
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which form a link farm hosted on disposable domains or compromised CMS uploads. The presence of JavaScript suggests it may be used to execute malicious code or redirect the user, while the link farm aims to obscure the final destination and potentially spread malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://amatnieks.com/pictures/image/96826503067.pdf In PDF document text
    • https://granitabrasive.com/editor_up/tegavigewuramujox.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/21319742270.pdfIn PDF document text
    • https://songhongresort.com/img/files/posofonisuganivipozowove.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/4425712083.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/52266108889.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d065c064---16089140371.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/pidosuzokivakikep.pdfIn PDF document text
    • http://skisun.it/userfiles/files/pufugigubawo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pomj490fshpuq9b0ut26k6574k/gukepefu.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/wamigalip.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/nudefukuseresajawez.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/denokozujosovirupepatinu.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/571594408.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/nuwixatolatigive.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/75563616921.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/94316072398.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/7751535536.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/8207302032.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/45219614471.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/jojudijalij.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/wonemede.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/47095525257.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c6cea030c5e451e4095ff51b82078657/46253696123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+vegas+crimePDF 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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 19216 bytes
SHA-256: 5890927526b91470ba03a9efe5f3f7d393fa37e9e71d8eb20592ed1da81174f5
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 10408 bytes
SHA-256: 8dc4d8f4aef0c268cba54de789d979a4111780d4660ca749270d8ae1b0017662

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