Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c29d05b1c3ae71…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 07:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4499305c5ff673ddab83a410a10a3a7e SHA-1: 04d69b72e619706914d614e0f841fb58b0c5229d SHA-256: 34c29d05b1c3ae710c07c68a50cbd792a2ed4ba2d7126ee1a2f9aed93d19faac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=psychiatric+nurse+resume+pdf PDF link annotation
    • http://jagdrevier.hu/upload/images/file/bitabasabeligadova.pdfIn PDF document text
    • http://consade.com/userfiles/file/mugobegikekado.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb729209e---33227905880.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/77357317605.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/jejizi.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/dogudomapokokilonubaza.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/61513464477.pdfIn PDF document text
    • http://nfc.soo.jp/file/39612894309.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ece1788e5---fuzudoxujadaje.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b9872069c3228bac1a4394e30006b9e9/78062098500.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/gukokaxeko.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/3bd3d62e95eb11426e287413da58b4f8/lituzowomovojinuziru.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/36257889063.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7291811e47a1fd6d3afb9bb9f4a44c29/66160458962.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/6dpvpb5keoos4ca0nc533fg344/sozas.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/62157644794.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/rewef.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadb4d5d3---bozip.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608040fc0641b---jusikosiketujodimikus.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a5c6b49c1c16e5aa7e15ee566785766a/juwurapa.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/44445733411.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/21904472807.pdfIn PDF document text
    • http://client.diffuse.info/files/69933134889.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d1d584bd---vinedadimem.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_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 17916 bytes
SHA-256: 97731844b569c9fcf7b19e9e7945b61d2ddb7928855795adbc33e7d55d0cd0cb
font_02_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 10936 bytes
SHA-256: 2c235f8ff5f4c324376306a343ffde8f9c696d967f79cad16680d8fcd4a917fa

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