Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e9f11fad7e4826…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 21:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb159c99ad668d80f9304af9c1c5d4b8 SHA-1: b2d4c165dc4396585dc1c569ddbee4fc00b00a90 SHA-256: 41e9f11fad7e48269b6c972e14c915ed9443b15f2dcadbb2fd88fcd25287af1e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to trick users into revealing sensitive recovery secrets or private keys, likely as part of a phishing or credential harvesting scheme. No scripts were extracted, but the presence of multiple URLs and the nature of the heuristics strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://standardamulet.com/files/files/zowozajidevetupare.pdf In PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/viravoramexe.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a078a80f5b---soxomerukemivises.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/nivilusotob.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/92817626980.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/migasexen.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135734259163---puverexatono.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/vated.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/famiguniralujaruxod.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/novemamijikibor.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/43829784578.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/kadefakowezipimefi.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/zijokemozupugaguvife.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/zilogorumasibubutetexuke.pdfIn PDF document text
    • http://sinostandards.net/upload/files/mivobimigiluvunaleresatox.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135358c20a00---xesuvuzobapesoferem.pdfIn PDF document text
    • http://umhouses.com/uploads/files/55723124735.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/45185496959.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/8934084489.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/nimofevojijefexonoda.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/lowugarifamagiweji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=samsung+galaxy+grand+2+kies+software+free+downloadPDF 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_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 17480 bytes
SHA-256: 39d2c16e2db0d6aa302fe38f457be9c3f50df2f8a599d680b964df952f962d82
font_02_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 11388 bytes
SHA-256: a4b20b1f25cfc0430c77adc33caa9422a7ea09bb54ba2bf72ca74a2f36ad62a3

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