Malicious PDF — malware analysis report

Static analysis result for SHA-256 128c0341319d2576…

MALICIOUS

PDF

88.3 KB Created: 2021-09-19 08:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74028f356f15b87fd973149b54e0420a SHA-1: a5d3d3bb0581e2f6d5504da9405d3dc5d9d1f830 SHA-256: 128c0341319d25766373854922786bfc0c3ac30f2255ba20f949e39f54d9b7a9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs and the nature of the link farm suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://tai-group.com/upload/files/61266853527.pdf In PDF document text
    • http://telecycling.info/files/file/23531708624.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/jabogiravuvibubifo.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/68835403078.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/sesazavizusomibogi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142206c50576---16592677649.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gapowilamewowidavubivi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614696b13d05e---kunoxoluzajisiluvulemodo.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zetox.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/36472848336.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/78608020591.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631134565.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/bikuf.pdfIn PDF document text
    • https://j26clean.com/upload/files/63868549056.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/47661434721.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363aab86dec---23744387584.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/nagakivunudunuwoj.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136f6852a771---88525837499.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/gasuvudajexojod.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210908153336_1907520277.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/13541372145.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/bokoxiparadeguxotat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=nokia+n9+price+in+nigeriaPDF 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_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 10476 bytes
SHA-256: d9348ac6ed8d0d88fdf7a5a67d017bc86fd122c22ebb14f6190d575c5a1b615d
font_01_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 20700 bytes
SHA-256: 0c34b11f3d070df640a61a5b4671419f97d7d4dc7df3d6ff2e01072773126172