Malicious PDF — malware analysis report

Static analysis result for SHA-256 3add49f4c6e1fb73…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 00:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab7b6a913660e3b3e8273e06565bb102 SHA-1: ffe3d8e34ac36a9caf1c888e855c921772001435 SHA-256: 3add49f4c6e1fb732333ae32a2cc3ade8cda8ceade9f0e8efeddb74c86ffced8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised or disposable hosting sites, likely to host further malicious payloads or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://erdemlerkoleji.com/resimler/files/refinalelofidurikegijeke.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/adrteg8una1oro6cfdi2mii8m1/tikekojuvarurubupesonez.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/55121954686.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/vederilakuwafizojepi.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/97010728198.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b124d99acf7---48674166062.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/resedetugubo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ffa87c2d4a90f42262dd82abcf0f112d/13499792686.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/todazuvulazorasa.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/nozofuzabed.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/fuwofodidurakin.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/55425661443.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/575bb693ac8c3044e97a62d210ce2ca7/81261519228.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722db2c2c00---45246805003.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d288902e27fc84d1d15252b51d79a537/24839603327.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d57dbe5046---72304797306.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/78483470253.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/goxumaminikovabexowoxi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f057ca8ecad---23842105038.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/q77oidatoi96fapbu4gc7a5p36/16847971643.pdfIn PDF document text
    • http://short-story.ru/upload/file/90574660925.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/pesagarelavodegisugoxupa.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/jiliwiwubidejaxitazokake.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e6b5d4c874141df1cd12e5341825b668/78933451365.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/gufajijure.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160978b30a38be---32448451279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=land+expropriation+in+ethiopia+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_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 10440 bytes
SHA-256: 57fcb5cbe4b3e136b076e738d5c1637d725440e329c86754c1da6fc1d2b3b49e
font_01_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001140b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140B 17804 bytes
SHA-256: 13110738df746b9d83093ce6be7a8f19fd1656ba68ca348e3064b0bf6e45d586

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