Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11028e5fbd917b6…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 05:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5db30a18296735674c9c01b51d797b97 SHA-1: 9e18628e86962d5f85a87039652a499f56cefe5d SHA-256: b11028e5fbd917b6f345b75667eb33c7278cbeba5ba5f0fe46bc274647cb7cae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=redmi+y2+miui+12+update PDF link annotation
    • http://songdolandmarkcity.com/userfiles/file/71750436938.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/icpv06mcbb4vd1c80im187sge2/molaxexodafabamonezixab.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/17098156235.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/67846466640.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/34326462584.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/40943043435.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/57764159660.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/62147770331.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/kosomisisili.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/98928629066.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/gikiregemepudivupuzo.pdfIn PDF document text
    • https://manenshop.com/upload/files/29002851497.pdfIn PDF document text
    • https://cicimanis.com/contents/files/34180742095.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/61662969514.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/80800064763.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc34b1fef---tezovasapinewaru.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/goxovaduxobaxibu.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/bogagunuponutigo.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/54720469092.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/geduwipuk.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a790354244---43258911107.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/56043977731.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/kebaxovujuvukevivefezexod.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_off0000b180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB180 15700 bytes
SHA-256: d6c6fb109b6cf628339c05551d9d13aaf330fc6ce1dc46443545a02a2934be9c
font_01_sfnt_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 10448 bytes
SHA-256: 5b9e9f4dd5b8c0ca8447e06d762791f5a65d151ce4845eae8cc477f0a592d56d
font_02_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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