Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0197dcec80d412…

MALICIOUS

PDF

91.9 KB Created: 2021-07-02 20:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f9890d51a2ce48ce08e18865011f0b23 SHA-1: 68f393c1a36ae3696be550ea4cd4215465df590d SHA-256: 4c0197dcec80d412a4b7cc80a1e746d908f734474a5be58f8f3bd32409200307
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and links to compromised CMS upload storage, suggesting it is designed to redirect users to malicious websites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=technical+analysis+explained+by+martin+pring+pdf+download PDF link annotation
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4b0e30cd29c3faa8a5fa876abee00f0/547093253.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c71b097512088b33565052fdd9ef7b30/noruxogakep.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cefc3987f423ca14101aa85f5df4d3ef/69637952430.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/kebaxuzixevilelitu.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/72277538047.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/sinusaxikipovi.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/matapewof.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e63e196e314590643d3b1d70cc6dbde0/2631952013.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/97477800519.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/fagixosevifawebir.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/gopavejutokemizawejizosoz.pdfIn PDF document text
    • http://gibisch.org/files/files/4834136478.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i8u76cvm943h2ct8icdsi15ca5/xasiwaloba.pdfIn PDF document text
    • https://tonitomov.com/picture/file/fawovikiritugij.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce35952e348---81264769166.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/59858783163.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/87159347188.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ecdcf3dcd---97886658345.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/buwaxotixepejiziruxar.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b98d5672737---92013503320.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/getiteva.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3b2ee2542e92aaeaf840b3f14eac82b3/58238502684.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/kesimixadabixaburi.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_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 17108 bytes
SHA-256: f49aaf598e20b53b51572fd8de37d857d235bb6119e3df641919483d6f7d9323
font_02_sfnt_off00014768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14768 11472 bytes
SHA-256: 50221dfe1928a4c6af903cbda1c1c6c41564a6609a89e9a1d1d879860acc46ca

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