Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff58a9f0c9a3159b…

MALICIOUS

PDF

89.8 KB Created: 2021-07-30 18:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1380644e5d1fb6b9b821d15c181bcb5a SHA-1: 3d5e182e78efd4a1cb40bcdfd83ee09a6b43fb4f SHA-256: ff58a9f0c9a3159beaf32bbb630cc4b4fb832a19996b181cbede47df0ad9f872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many hosted on compromised WordPress sites, forming a link farm designed to redirect users to potentially harmful destinations. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the final payload or distribute it across various compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=placenta+previa+radiopaedia PDF link annotation
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85899bed6a---zedekikizixepiximugebokuv.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9d42e9ff7b83739259ab9869f6cb4fb7/gogezosajuvowaritijafewi.pdfIn PDF document text
    • http://renknh.com/ckupload/files/kiwetuguvifufisokaxifoti.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1bdb01ee4d99ea78e446be7d7ba37b20/xazatikakafoxiwe.pdfIn PDF document text
    • http://guitarenko.fr/img/files/mipapunitegozumuki.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ec9297396935ebaf4f53f6f7789d3927/79425740038.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/52534508520.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607540519bbd5---rusawemelazekuxebuxos.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/mafiromasibaravorejosumu.pdfIn PDF document text
    • http://ccsl.asia/files/joriwejawaju.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/154j7bm0j802phinrlcuvliq3j/losematofapudurojab.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/xuzudawowaranod.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062219285373499.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8570f8569a09f0584871567e95ecd6b5/6375352224.pdfIn PDF document text
    • http://short-story.ru/upload/file/62739191224.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/nhk7m9nman5drkj9v0ujgi7ltk/segiku.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7275fac459a442be175f069d38d56173/76273437519.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7572b6f1f---pirifukekevubaxasar.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fe3f28204---kitabu.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/wusezesijoxizutanoda.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/40749572570.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607192fa45181---14367506798.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/21b5ca799f5cfde658eb5bcf73e91b33/losew.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/74717359868.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/povofudotudowu.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_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 17384 bytes
SHA-256: 18146ab5b3edbf13910636bb80a9c964f4e35fee26b987811260b47db2b3af41
font_01_sfnt_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 10404 bytes
SHA-256: 6afa49d6f82e7459918d3d9357f65187f17e7839a5d4f4a8effe2c9af437cf6d
font_02_sfnt_off0001416b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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