Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ad0f37579ceff4…

MALICIOUS

PDF

88.1 KB Created: 2021-09-01 17:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eec3c21e218fcaa75b6ccdb802432fbe SHA-1: 7265d3cb037a6a387b3546cd976c89b77f405e3b SHA-256: 14ad0f37579ceff40b99f9bebfbd1269f14cd697d42efc4481681cb1609734b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd62d4f3d60---73232426063.pdf In PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/lufofimebixulaju.pdfIn PDF document text
    • https://people11people.gr/uploads/File/19034775790.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/11886489080.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/76029748569.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/9271873817.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/xinedilitolesizujejot.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/wuwegu.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160749fa2dac6a---73997417594.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/misorikiwoboder.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161036ed20a3ff---7421758623.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/j9g7evllnbebi3h50ifkr76qba/36040761470.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/17585170652.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-8-11/20210811003440985196.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/verovekivafasikikefugowap.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/faveferozaliwelu.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xoraxuvexanid.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/juwilek.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/nizuwepemumuj.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/53884226228.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bbf4518fb5---zojozazokikojepal.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/letik.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/xisodelolukagajipemuxofuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=james+and+the+giant+peach+free+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_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 17956 bytes
SHA-256: 89ee834cbc8bcb2975b050677d008c7d6f4604b5fbb586c20aba9c7b6d74d972
font_01_sfnt_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 10892 bytes
SHA-256: 0ee8e230b0b0b49f9d2d93a0eafd57a0e590783d290006284d100226df7c30a4
font_02_sfnt_off00013925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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