Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9a75979e734446…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 06:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4e9e510bc85391c9dfda49a170b56b0 SHA-1: f6b3f0f59ae0e3b28f3fdbb4c8fa1269a2336096 SHA-256: 3a9a75979e7344460ae312af5fca787b498e10aaa867530b3060ece8caf45514
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://olgapolyakova.com/files/files/62265282632.pdf In PDF document text
    • http://buyo-g.net/userfiles/file/88194055698.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/zisix.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/40483586996.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/xumamar.pdfIn PDF document text
    • http://findusafranchise.com/files/files/pibulodadozekunuk.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/12093406508.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/32836905193.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/91879382382.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/jorukuviva.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/perixugufojuj.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/cjp3a6r9higgkjju4275n3numn/murafenunodotepo.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/12983272583.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109011252047662.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lujolubadufabusanuxemu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/gb046h3d6otrvlc822pljchsvu/tuzapujuramusegurukow.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/mugurunak.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/wobumuzezoxusukeditekew.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/3865659969.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/kokofo.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/26386135360.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0176245b91052d282d0e97f4ce51cd2f/fugimoxevi.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109090826528765.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/dalamojulitoxunuwi.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/21583936767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=4+types+of+lines+in+artPDF 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_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 16832 bytes
SHA-256: 79ae1ab6c37c6bd6dc5956ddf25e45c454a6fdf170405a28e7ea30dd60d2c8cb
font_01_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 10444 bytes
SHA-256: 8281dca8a0c7086a51b0e12dda5a84bef72a553596ff4b5235861c9191c95c9d

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