Malicious PDF — malware analysis report

Static analysis result for SHA-256 742e9aaea1e2f6d1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 08:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 5401057abe3c29e8b7963bb418534ccb SHA-1: 70db0857fd08731f2ffcc0a7245be05e8ea7821f SHA-256: 742e9aaea1e2f6d172a5986e578fc70b7b9347f6f1faf704c13a1137e2357a33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ladangmimpi.com/contents//files/zezowifodinugokuxobagima.pdf In PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/micjn2okqgk75gf9na5gt1idn1/xapugawatiga.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd20b1dd2---gegidozak.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce20486aa2---1893375893.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/43400938508.pdfIn PDF document text
    • http://topas.lt/userfiles/file/81687355098.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/34591834031.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/figumikega.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/xawodivososojodu.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3e19edd217b1639dbcaca90ff54e33b8/bepisumolu.pdfIn PDF document text
    • https://securitydm.com/slicice/file/sedaletewelupun.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/gadevaraletowusukupag.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/b70q581phc8amc8eb2v69psnrd/vujujunipifotug.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/nixojufosiju.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160965984032f6---sokupaso.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/da741ceb957ffdbb3c72f9f29d0fe85c/pokiwebobolorojosuga.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/24015274715.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/50759541349.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160723ebda1590---kumopupep.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/rovikeribokijujuso.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6131838d750ba.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4312120b7---wobojizajutuvajorit.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fixuben.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/mazexikurujunikelu.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/39104432854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=rutina+de+calistenia+en+casa+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_off0000d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 10536 bytes
SHA-256: 29b3c9f24fc88dd2a013053c1c132c7c9197c24d33dda4d08612256acfb78bc0
font_01_sfnt_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 17904 bytes
SHA-256: a6aede461adc450633458cdb93bf2130af1f311fee6f8b0dd3faf568b890ebe6
font_02_sfnt_off0001161b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1