Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e84767ce2276b4…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 16:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c03a17c51ae159a88367f632c40802c5 SHA-1: 011291d238f5f18563c404eab07c6d29cc354567 SHA-256: 40e84767ce2276b41ce181c32d875f5c98c92a5a9e20987eca19b346b03184d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using non-clustered link farms on disposable hosting, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crewmak.ru/uplcv?utm_term=best+android+to+iphone+transfer+app PDF link annotation
    • http://teresachild.com/upload/files/sofoboxapebusanivonixo.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/75570592353.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/67162532971.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/79567380061.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/xuloseba.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161425cca8108a---27983741482.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/24899064957.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/tetusasoparokawedefuwesug.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/lujibipakawevupopitidekal.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/58c989fadf504e968537ed741b85cd4c/latozowadutejataxuteti.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/95792328523.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/satikopovawo.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/kabiwatogaduweboj.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bd9d036b---jakofejegap.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a6747419---99855450415.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/bapodisariliruwokiwoluda.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/52625542545.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/97875961023.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/3069000812.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/tegesisunotiwekotizizovoj.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/17357513828.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/96997394639.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/tijorixovegetawesux.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/3541313282.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/kozuso.pdfIn PDF document text
    • 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_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 17032 bytes
SHA-256: 1af6710f1f7b866363ff95d826fb756fa7c2d0d4ad18234587c171b75a623277
font_01_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 10600 bytes
SHA-256: b9371a7abf1911031f0acb5a7b7ae9a2b3a867af164350ddd49c95eed90eea34

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