Malicious PDF — malware analysis report

Static analysis result for SHA-256 f095889dfaa7383d…

MALICIOUS

PDF

68.0 KB Created: 2021-09-28 10:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: caca8689527c29b26787a0819c752b38 SHA-1: da226537dab806101306d37e1e05a1c4c243e2c9 SHA-256: f095889dfaa7383d2438112028bc27965762ba88ee9baede14d9a0d61e032d9c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://infrive.ru/uplcv?utm_term=line+dancing+exercise+classes+near+me PDF link annotation
    • http://sbstroy53.ru/img/files/87041758852.pdfIn PDF document text
    • http://tradotel-riviera.com/file/danosekexof.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/pinukenoropez.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/ferepovezadakawomugad.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/ruxiwabi.pdfIn PDF document text
    • http://inspeq.eu/public/files/josebinafuxidufan.pdfIn PDF document text
    • https://renewone.de/files/gitulenevimiratuwojip.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/losas.pdfIn PDF document text
    • https://service-panev.com/userfiles/vadavafakik.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/62296011704.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/43375145657.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454c3e55f64---dilidafebaseludu.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/45583737840.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/wufikaxotezomagafa.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/bosafumubumife.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210904_213250_9701.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8601f29fa---petudoseduwokivifuvuz.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/kinugakefilitex.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/18250265909.pdfIn PDF document text
    • http://xfswchem.com/upload/files/wibuvazuxaxijebimejon.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5dde7899---88095785779.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/2411819687.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109271820395973.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_off0000ada4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA4 10552 bytes
SHA-256: 7e103c48385bbcaefc6c16be54faf92f4b35be443376fd0341ab05580fb5cfa2
font_01_sfnt_off0000c565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC565 14724 bytes
SHA-256: e5ebea2ee2767e4934c52216c965630dc2d508132a202af38cb46843a484eb81
font_02_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1