Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9a5b3231e32e17…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 23:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 44aa68022366866420457f279cf8980f SHA-1: deeee6f153b0039f90553e8e06e00399d2ee9221 SHA-256: ee9a5b3231e32e17165906c3e04869f5fa50dcba6b9691ca0e1da6e361ea0d1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic further supports the idea of compromised infrastructure being leveraged.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://cructi.ru/uplcv?utm_term=q%2B+tv+box+update PDF link annotation
    • https://clinicscrm.com/img/files/jizid.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210918034545.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/79943272930.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491ebe05c3a---fujafusudegefevavas.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/saboguterejewewo.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/daruwarub.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/satunugabij.pdfIn PDF document text
    • http://wic-net.com/userfiles/file/82484792622.pdfIn PDF document text
    • http://leguido.net/files/24083837629.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161323d9db0593---72412143119.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/65703056643.pdfIn PDF document text
    • http://fygl.net/uploads/file/132330556103.pdfIn PDF document text
    • http://remobudostol.pl/pliki/lemizugodobuxujejopa.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/guxokomimebarazovasuf.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/befovovovowaxugiz.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/vebewojijorimitiguxabow.pdfIn PDF document text
    • https://henuopack.com/d/files/kikujatexojudixejopeg.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/kekujek.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/15593866883.pdfIn PDF document text
    • https://actor-conseil.com/files/file/96064990002.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/17439369885.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee1003c0bf---surosimegaki.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/63a863a85c792262b829e4160b7d39d9/34689431556.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/jaxakanigasunafevixera.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/82009193495.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/kmm2438cgmmn10tiv0tbr2n43m/rogejuseluvodob.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_off0000b155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB155 10340 bytes
SHA-256: c3b9f0ea95362c9daf759d7017e96113ff9ac545fa099f0970e437b5b7a04c49
font_01_sfnt_off0000c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 14724 bytes
SHA-256: dcec830ab2236d7dd29df1ccfe586d15ab6564cded4fff31f582f35e76e9106c

Open this report in the interactive analyzer, or submit your own file for analysis.