Malicious PDF — malware analysis report

Static analysis result for SHA-256 092b9b4dade5cf49…

MALICIOUS

PDF

70.4 KB Created: 2021-09-05 16:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9705e4aa30ef93119d3dbee12274d305 SHA-1: af820cab6205681112e10b13d113f97babd43a14 SHA-256: 092b9b4dade5cf4941bc25da429d23e12f461a1739203cc60520fc773e3950b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://golfvillageonline.com/userfiles/file/47413524537.pdf In PDF document text
    • http://thuduchouse.vn/pics/file/lebin.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/meparoropapiw.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/konilaxaserad.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/fanepaganoxa.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/31698302719.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/86c135855b12f4b4381d471d583ec684/mudajemawifekaxatuki.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/11828355502.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/23153701781.pdfIn PDF document text
    • http://lianbang123.com/uploads//files/202108111950514752.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/19316530576.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/gaxapawakafidamuf.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bb17d6ac0---kimanafenululekimip.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ed092dc3---12934053652.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e76a6d6ffc---tajulijawa.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/80831986626.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7k5e88gfpt16mqgsjg5ltodkhe/54042303155.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d295cc385fcd2aec22ac47a4c3f677ea/gawebugo.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0a7e5dbd2---47259559273.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/vorap.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/tatiludurowimedepanik.pdfIn PDF document text
    • http://araonline.hu/uploads/file/12483939811.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/97516504271917232d62b700fe6fcadf/33600902827.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/givitudafawuberijizefu.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/50240352011.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/wadimavunaxagekapowan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hypersensitivity+reactions+review+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_off0000b521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB521 14872 bytes
SHA-256: a371bab5b590e00c7d458bb49ee9e2333dd9604abea429c5024988fbc1be75ac
font_01_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 10824 bytes
SHA-256: 6f418f3578d09da44182ae15db3bc8fc3b31d88e4d5fd75ecb5f0331dbdc71de
font_02_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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