Malicious PDF — malware analysis report

Static analysis result for SHA-256 c420f0f9e3a7d7a3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 03:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fcede498668200a6cfe1062624b92c16 SHA-1: d32f1360fb595c345378bb88c96eab77cf8d127c SHA-256: c420f0f9e3a7d7a3bc020c9379448dffb4026f4f41d8324450796ece3d1d7722
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ad1866483---jedoxonegupugeja.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e84a240628---40592421162.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1611bde13b4d5b---34746821280.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ppb8ibsfng3goqa33k48uqcipf/vasowozaxiresev.pdfIn PDF document text
    • https://btegypt.com/file/66989583624.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///23816177831.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/52456330692.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a4496284c---nadatarovogasewapiloluza.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/nesubijadakivodop.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e7136de05---doxakad.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/nuvovewoweropiremuwuto.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/naroxegixa.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b2d65858---voxomakesuleb.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/zegewirawa.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/fotutij.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/43211807210.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094906d3b392---4191979923.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/68808225394.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/tuzalilapugofo.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/vetugokulimopalifexup.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/weguzebazopakujakukumuwil.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/41680260618.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/77443804636.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/lmgnu1uve9c60rn9lce1qkjo57/69477036616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=amazing+grace+lyrics+and+chords+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_off0000cda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 18240 bytes
SHA-256: e68376e405b50a73831b78b1472d10bd698ebb55e9e8f3c7f486a13c43452d34
font_02_sfnt_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 11124 bytes
SHA-256: e1ec84d85bf2dfca364bda66c4dc38471fc47571c655eecbaddfbde5f1d90eb7

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