Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce3ca61b7f13a3e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 03:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da5b6d9b57ee9606fbae2395dd46c8a7 SHA-1: d59c0ab1839b2c2aa63ab139c9e3b59763b8f150 SHA-256: 7ce3ca61b7f13a3e6051550556f2bd024460069bdb75529f6b204f6e66a682fb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, specifically using a password-protected archive pretext to trick users into downloading potentially malicious content. The presence of numerous links to PDF files hosted on various domains, some of which are associated with compromised CMS uploads, further supports this. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the delivery of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://websbag.com/uploads/files/remakedawadoxuniz.pdf In PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/43487809496.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff9376317a---dojugefuribazegamonamam.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/zutepovoxew.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/6805348557.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/mukilizine.pdfIn PDF document text
    • http://expresskaliski.info/file/kasepuk.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210516095110_0xggj9.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/bcabb915c267a6e124395805f35805b7/77615690101.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/44bf7f65bbe8501c3dc207b76c8d4ae7/manakaxapawutonakufewelu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609232bef41ff---18327711474.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/pijuruku.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8b488bjpofgqeu8t5jd4j7d1bg/78471695988.pdfIn PDF document text
    • http://etkenkalip.com/CodeignterProject/vizyon/files/88212199959.pdfIn PDF document text
    • https://xistenze.com/files/files/45645550481.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bv552lsklp20j6jt611oed3b73/kifubaxipiwis.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4948033fa0---mutevovenez.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/97530787575.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/jm3ifn1bp36v4lagdcl28pas7i/rovusifukimoresor.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/32117862897.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/badufuvimajakidin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+password+unlocker+registration+codePDF 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_off0000d28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 17316 bytes
SHA-256: a2d452532d4d7184e87fe4033cb57f124aded504251182d33a788d2b9919a35f
font_01_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D1 11076 bytes
SHA-256: 795430947784dc2e3efd586ff9504ebb4856d8113bb9f04ed3495b0199f2410b

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