Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b342c511a839480…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 08:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67ad3b9aaed477123ca7d8b132cff57b SHA-1: d38b1e6a8a4f9e172458b1fd46cb80cfc19fd1a8 SHA-256: 3b342c511a839480cca7d6a2b20a977e6a8f9163257c95a4a63489ab9311b8b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and a link farm structure suggests an attempt to redirect users to malicious sites. The document's structure and numerous external links indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://woods-china.cn/ci2/userfiles/files/20210530170532.pdf
    • http://dspec-car.com/js/upload/files/lojejiduxeges.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1c271517489d0f6dc753d395078de880/95232051172.pdf
    • https://telewebmarketing.com/FCKeditor/file/bevekivegivuxosa.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a51f256cd---lugubapik.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/87da2026f4c7d4a0e82968aa311b78b2/65683210033.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tapafurijoxowivaj.pdf
    • http://naphogacomposite.com/upload/files/22193009773.pdf
    • http://chrislahoda.ca/userfiles/file/jekuxiwugiwiraka.pdf
    • http://nhasachconggiao.com/luutru/files/gukelomuterekebarusakuxos.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609363e152bb6---safojutemobefaliwus.pdf
    • https://infypos.com/infyposcms/media/wuvesegukuxeno.pdf
    • http://machinesupplier.cn/data/product/file/2021821_23135_681.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/474cd55ab92d8b0a7329d4db65359fde/38960296075.pdf
    • https://powermailer.in/userfiles/file/63894717369.pdf
    • http://grandchainfamilyfoundation.com/clients/85333/File/4771777174.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2582e11d34---13686140291.pdf
    • https://rosanaalvarracin.com/userfiles/file/50383583284.pdf
    • https://bravo-hk.com/userfiles/file/monozanezorakararonorinaj.pdf
    • https://alrashed-alsaleh.com/userfiles/files/33490440201.pdf
    • http://cestovni-postylka.eu/userfiles/file/mutotin.pdf
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/58501980129.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sportcraft+turbo+air+hockey+table+model+34012+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdb4.bin
4daf06da480bbab5f1afd73036cc3f8bce520fbe4bd71a8b5313ba2f7a8ae7d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB4 18052 bytes
font_01_sfnt_off0000ecf2.bin
670ba1afc3f8f8c3d24aef0966366e6392a036c6333b1817c33692bb07a929bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 11784 bytes
font_02_sfnt_off000108cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16792 bytes