Malicious PDF — malware analysis report

Static analysis result for SHA-256 8482eb1416cafa20…

MALICIOUS

PDF

104.6 KB Created: 2021-09-19 09:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9c42da7225a5ccf97d3c29797b5be4a9 SHA-1: 9f0cbbe5ff0528fd3ed4f4d670be3106819be045 SHA-256: 8482eb1416cafa20c59f6d5d0ac6813850f36bff40aeb2025a4c5309ce806ae1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cmtsport.com/pliki/pudojapejapijosu.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ke384e8nglo8bcgvuga2ebs449/peluweserajugaw.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fff44b5728a545cfcd2948aaea7e0221/93808626749.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/zowugadazeruruzupitiz.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210909_C344EB0FBD26E3DA.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/12984409875.pdfIn PDF document text
    • http://khocabien.com/uploads/files/27335706046.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/somixavu.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/xesutixodozojuvamise.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/munozo.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xunizanewabositawen.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139b59aabf84---99340991645.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8767ab924e9a13caf642f63a6bf60a08/nesabiberili.pdfIn PDF document text
    • http://delve-cr.com/uploads/jajupasugexapafinijatasob.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/tegupiteg.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210902_A2D91E020D833E54.pdfIn PDF document text
    • http://fitviewer.de/files/file/92512295089.pdfIn PDF document text
    • http://iucecb.com/files/file/rakosusizul.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/jixejekidaferuxufex.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/dhbcbnm88q8g5ate8blcb7h4gg/27615328398.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/66416167897.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5bb8017e---motukukuvuligososu.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/71784427623.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/25044201275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=angela+carter+bloody+chamber+pdfPDF 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_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 11040 bytes
SHA-256: 1fe48222d72be5aa559e64a1f33d2f9111e38d0cf4774c86779db431288e98bc
font_01_sfnt_off00014af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16303 19232 bytes
SHA-256: 5bc607eb9f5f8a74837ab2147667785dfccadaacc82db2c5d5252f0709f06e3b