Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80eec640c629bd1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 06:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9d2617e2fe22619b48822aca95e3af3 SHA-1: c1ba5e072250d492c9061f22e55511ad79650a6d SHA-256: d80eec640c629bd17668c32bc76f3b3d2c7ec04fea9d5590d76bcc73999955b6
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://baoholaodong24.com/userfiles/file/bakugitepebu.pdf In PDF document text
    • http://ccsilver.kr/files/fckeditor/file/38469956660ffd7aeb7755.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/020c0f61a4e96bc2a27066e176027081/41256190325.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/sudewuwujadebab.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/nodojeporijivuvitokopefe.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/12562596034.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/kajufumaritusux.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/669552a4f78f255dad73d39e32b89351/julozesa.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/91012616823.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/kipavuleguxirikuk.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/bixujapelanajagesuv.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/ruxizawotuzapagudenujumo.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/3492bb718fd5f8af7b901e4e61020d51/98195377481.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/4295512189.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/89960581523.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/21066855944.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/nebemeta.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/31149911293.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/kedopuboxilut.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/6066311167a77b70553814a658918bd1/18335132825.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db72ff77144---tovutavovexixulexido.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/46275739952.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/sikepimoposujop.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d598487ce---75242689552.pdfIn PDF document text
    • http://yejida.com/userfiles/file/bajabegud.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/66978231279.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab924732ca---womorefiwapijavezepewane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stroke+guidelines+2018+pdf+%E0%B9%84%E0%B8%97%E0%B8%A2PDF 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_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 11280 bytes
SHA-256: 76e3b35b991f2d28a9fb95ed0d4242a2807f36a338ede74507d9d9df93ce10f0
font_01_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 21564 bytes
SHA-256: 5028de6356776798917966e91e6b34ad607ceb3594188a35f79064df98932579
font_02_sfnt_off00013093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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