Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36153350c73c9be…

MALICIOUS

PDF

95.7 KB Created: 2021-08-01 16:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b4a1bd8a611f769a86dca43d834bbff SHA-1: f55059f1e612b259d243a6b8f71cbd6bec0e2dc7 SHA-256: a36153350c73c9beb14b8a11b476fef46a9f693c6a23d952e4ba566b3fc7afb1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://anfauglir.com/images/file/zanegoditobisutenilobo.pdf In PDF document text
    • https://pachetedeturism.ro/images/files/77655601887.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad0102209d---54100219866.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095296c24d6c---lijewonenogogozebelesum.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb4f8cb02b---bofegutepi.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/74c4053e9c83d3098604c8383aff7781/tavukowalelisunofobakupov.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/a8e35bavjqtd5ijcsn9sn23bpm/vajovinemod.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/48571597091.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d38e99e4---51299397565.pdfIn PDF document text
    • https://iohrp.org/f_files/files/41975056373.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2a93fc94---gixumugufogixogud.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ee12f55a7fea7080e8663f400121f93c/71600939167.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/60332716807.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/78184841300.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/27075081654.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa06fb47b0---67877783506.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/12073584688.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/cbe1d354ffa67bc1b9e0da01082fb822/wugekalagibu.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-24/20210724150452541341.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/nupex.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15773e438---gimedagesevewekodutetatib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=who+am+i+quotes+ramana+maharshiPDF 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_off0001153d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153D 17320 bytes
SHA-256: 15a64f14ac18ab9b31d6be66bd8aa863d9be16350899c304afb7a010b2d84258
font_01_sfnt_off00014176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14176 10564 bytes
SHA-256: 47994174d17871a968df473f5044680843a33da7415e0c7d9123b46fe40a3cfc
font_02_sfnt_off00015973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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