Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16402948d256089…

MALICIOUS

PDF

88.7 KB Created: 2021-09-06 03:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 353cf28e822562629dbcf6e1a98e208d SHA-1: 57fa94127f21236ede7ab4573d3e038f308cb939 SHA-256: d16402948d2560891b44f19deb881901d8ba7ce83657f01621c470f595ac65f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate a link farm designed to obscure the final destination, likely a phishing page or malware download site. ClamAV detection and the ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://angarakshaksecurity.com/userfiles/file/zumuxokakesuwutawolaxe.pdf In PDF document text
    • http://clairvoyantinfotech.com/demo/images/13683638542.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e64847d7c80b8664fa7bbd9e36977479/javewuxokakukujuf.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129201ed88e7---34692717170.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161216f7e82e94---repotemojezujobatuwuzezi.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/60580829684.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sexopalapanovarudijugez.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/11155305605.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/xepixenubiwuzabafemajater.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/8716715987.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/acdbe2719b1579c91918f4ba9c28b9c5/97122508032.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/74239720344.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a8fbb08af---68464953113.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/fa8a474255d1ad128c608cffad3c318d/sotanubibebojunem.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/katezawuzinefowi.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607749d5ae0e2---7125137987.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/55083770105.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/vixuroxuvugetudugavom.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f1822b986c0b88fc624dd6bdc098dcb8/zubakabuwowaninovefu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3pcpshivj5vjl4ecvlbc8vmqp1/xotamawafasuji.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a7d462b235bb349556c704a6e2f4efbd/9257710698.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa1c93232---botiborusipefazovelodosaw.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/madip.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/memifetomiganidajolus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=designspark+tutorial+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_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10868 bytes
SHA-256: e7f2bf8f0e2d701f7a1a2219488e512b5f322d7061b26a9c36be8ef461818af8
font_01_sfnt_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 19952 bytes
SHA-256: 59b1d0aae28395f70e9080ad01b7ac721ce3b19b9605a3eb64e1863493f6d28c
font_02_sfnt_off00013d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1