Malicious PDF — malware analysis report

Static analysis result for SHA-256 398e52039516a86b…

MALICIOUS

PDF

83.9 KB Created: 2021-10-09 16:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0efa33e56173671edac44fdf67f45fdc SHA-1: b57d29c1004bb754f5427352cae63dcca112e17f SHA-256: 398e52039516a86b777f0d730dac3129188eed4b09a3d4928892cf6269924dd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute further malicious content. The embedded URLs, such as 'https://drafthe.ru/uplcv?utm_term=systolic+pressure+high+and+diastolic+low', are likely used to redirect users to phishing sites or download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=systolic+pressure+high+and+diastolic+low PDF link annotation
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/divalarami.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/gojosi.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/sudegemibalimetuwavidenaf.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/95304832159.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614102f24021c---60690873757.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2ce45ded---nawelapopadejowofazos.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/moxilawegoxivopuluso.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/13123019546.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/vurapugepugozelew.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/09e3f08518fd29108cac5eafafd6d57e/5758065691.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-3/20210903142606386920.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/18138551497.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/wanuk.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/xorilezabaz.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/segab.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090709155273499.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/negebonigidas.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/14246373910.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/16470366849.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/galajod.pdfIn PDF document text
    • http://mariellatriolo.it/public/file/jagizasakejinoza.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/28352709793.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1fa6df7a---97082473156.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/duwunurijunivunozonejuj.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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 18736 bytes
SHA-256: 516047def6a1fa9c9d89d54628c703ea1a1a3ac5ae26f0403463e2c8009bb17a
font_01_sfnt_off00010f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7D 11168 bytes
SHA-256: a157865b6a0a8176f9f5442f4816dd8820503e5dcc49bffbc5582938df292a71
font_02_sfnt_off0001296b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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