Malicious PDF — malware analysis report

Static analysis result for SHA-256 416e37dd31d9f46d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 03:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0623303e145474af490ecf7b4a380824 SHA-1: ca5c31f2cfd3a28b55cda1c8a328896a1a2b0e60 SHA-256: 416e37dd31d9f46d255f5a8b8eb07f651c0d79c5a31e7678b9a6807d9fe379d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=hero+hunters+mod PDF link annotation
    • https://ddc-touggourt.dz/ar/files/86324999726.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/41128854840.pdfIn PDF document text
    • http://net-marketing.hu/images/files/98764631549.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/99192955622.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/19941750023.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d67363ace6---16845453837.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/wisizokefiv.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/fvoknea3b8tvk3a1khhekgq56m/xanuvedak.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/vesonitefanawubipite.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/sodesux.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/suwuligobituw.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3d90aea1ba42625685f34a6fd4a95e02/lazotami.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/79965806025.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/mimiwafuw.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/gemufilataxesekamoso.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/fuxazerasupilagakunanukug.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f96170ceb7---zorigotiweko.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/jogomugavivava.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/tujun.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/solenob.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/vubotuje.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/29027130963.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/besolezavoduvo.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/62191525514.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/wirelupezopena.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/15288405302.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_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 18216 bytes
SHA-256: 2d9cb6f493ff5f638fe5d5281db83b496d390c10e5e33d3fb59a03aa5b62eda0
font_01_sfnt_off00010f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 10304 bytes
SHA-256: 94cfb470c5a71eb09924330a5572ace1b3a0de6e1d1ccb6d0683f767e97f9a68

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