Malicious PDF — malware analysis report

Static analysis result for SHA-256 127ea161d9bd8d2f…

MALICIOUS

PDF

151.0 KB Created: 2021-09-04 18:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56569e801ec3ebf4ff4b04d11d1dedb3 SHA-1: 16d283dc40b39c097d3ffb4370db1ae1551b760b SHA-256: 127ea161d9bd8d2f76121f607e9547dac3cf62f30865ce51e00353717f800639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution, by masquerading as a software manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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=paragon+hard+disk+manager+15+suite+manual+pdf PDF link annotation
    • https://apsco.ly/userfiles/files/41812877917.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kuwakuwafuw.pdfIn PDF document text
    • https://slide-bearing.com/d/files/1375939497.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/44555049791.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb7e12f235---fukumufafawenipedome.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/juzasilipimamutakuna.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f1a3b8716fad9f5c0a529e917451112c/ximepitajovojiri.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210804164314.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/66195403024.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/39f30c88b0a2d691bb92f8543f05e1c6/90599948669.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210623124728_2027811678.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b139bd02fb0---61537693292.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/47f0bd1f177e8f77085ae2c7b3ce72d2/29464961819.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/lezigileboputivalizob.pdfIn PDF document text
    • http://airmon.hu/images/files/15212931306.pdfIn PDF document text
    • https://blogsma.com/files/kutewubodasikeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a517c90921a---73361176511.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/51514986537.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-7/20210707184842221908.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/gegevazarogosat.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/zevarajuteboj.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071380aae8ef---15664047757.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_off0001e348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E348 11324 bytes
SHA-256: 49b707e3f3ca67b2a4f18d92ff409f6a3af5d1d87c8f1b8ff22e24af8a0bcc49
font_01_sfnt_off0001fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD96 21228 bytes
SHA-256: 005ba935f2de9e29e739603aa37b27b53230ba833cb81571a582abcd49a70cf1
font_02_sfnt_off00023563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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