Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd4c275eef91465…

MALICIOUS

PDF

82.0 KB Created: 2021-08-20 00:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4c922721ccba066471369ea8baf85795 SHA-1: ca6795736291e96c4748361c662ecee9d5d57a80 SHA-256: dcd4c275eef91465a872b70900ff50385346a47a5900e3c1f54e6605321f60a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=ejercicios+de+perspectiva+caballera+2+eso PDF link annotation
    • http://dashoernerboot.de/userfiles/fizafefujinezejuderezog.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4lro5qdm7isf62ruetks6jtt03/buwitudukixijegosid.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/32200434032.pdfIn PDF document text
    • http://canoeing.by/pics/files/41192259640.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/xibovosetosavi.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/463343402.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/35778202589.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc5c883a87---botakokaza.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/63348954067.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f090cc855a---79010177404.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/bifimixanefevokof.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/158c28a4a80ada7afa6fca7bbd1be3b4/15041946552.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/9ca87bd0cae363808489b93aabc11e24/74693606292.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5c8r8fp729a0vbhquceqv0j2ho/62392638254.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/11sope9fge5kl77sgngotjudk2/68275764823.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/9i6vfng50fbskl043vs1sgidkl/likeravebunurepipadade.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/redujezulalipenuka.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/13713392638.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/nurojerodekotadu.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210702200811693568.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/zolaxik.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/8953330988.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161049164d197d---17823906569.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_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 10844 bytes
SHA-256: 8bea00e28994ca9255e7691fd57b72dbe98090009aa350927e9d00439b945da2
font_02_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 17056 bytes
SHA-256: c1ba6dcdc9c4b053fd8e3463fa97795da2a24db31fa49b7f7510970e172bb950

Open this report in the interactive analyzer, or submit your own file for analysis.