Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e47131741a5d30…

MALICIOUS

PDF

79.3 KB Created: 2021-08-29 00:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5156a9f0d9e02d9509f499c80812525d SHA-1: 8905f2669e1c49804c63aff181fc440eb4684f2f SHA-256: c9e47131741a5d30d6ac4416a6f59243c3e321fdb527b43f6a24f572ae358652
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to redirect users to potentially malicious content on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebbb7dfa0d---79057220770.pdf In PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/55976605150.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/40231029547.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aaa83cfe9---92531361573.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a75be8029ef---xajamalupefa.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/92c57286e39bf9498f8cd161dc927e02/71712910199.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/6592620393.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/simozimufudazovivuxegofus.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/82013234714.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/lokapatot.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/lefibarokesonaxogi.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612783517ad76---setibufefuvoxawiwatirugi.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4af38b496d9ec1428c7e86d572d8c615/wasoxivi.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/giwanajazopojefolivov.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/wozibexixowus.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a640ad118fa---jepijotimejowe.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a09ca3e2cf1---55508850943.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/xeparumemanesuxu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/56fec14f62f3616e3f22f8f587d95e11/40245115213.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/29599451282.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bf714f41f---dovusax.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/tubaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=o+god+our+heavenly+fatherPDF 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_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 10676 bytes
SHA-256: 71869968c6bd7c02db6d7b7443a8f76025ba37b618af1639cf2fc863f54d0627
font_01_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 15980 bytes
SHA-256: 2c54f307bc5442c60476a3b76afe421aa29891e4365803051b3e2097c149e35e
font_02_sfnt_off000116ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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