Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdd384ed3adebcc…

MALICIOUS

PDF

94.8 KB Created: 2021-07-05 03:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a93b716689b987124c228e1999c41394 SHA-1: 765662444547b0309a8853c38463dd1312c0b83e SHA-256: 2cdd384ed3adebccb4c1c610341ff2821793d88e3a7fcf827f0149d868cfae0b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to these compromised sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=capital+of+libreville PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91bbd429f1---nafin.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9781f484df---bowagof.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc95a88570---banelikemixagomonazumos.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/neeaerh70hfpq50tu7rdpkm115/wobukakin.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/16603675707.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/u3konvj55ire0mcsp4ba3vtq3f/98669865399.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/wunatunipumub.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cba53de6a---kagexazujujekixo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607653eb82889---firuxoferujubufadozurona.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1bf00406b09cdf019e89fc5efe5ec19e/17826579135.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/tufuz.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/zerabatixegufen.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/071c58863043f21294a974344e048958/62515317692.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/fufugabulibi.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/vezavavunozirinik.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/40806261564.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/ropekofafuboguxosib.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/larokivexozizupudivekol.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/740a934be7a93496f9424f92023879f7/78527203495.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3003cd424b---bizivutexujevagosopori.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dad2e6451---fevoxolumixadajoxejotij.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_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 17260 bytes
SHA-256: a575f2e0f47ac31b2a9be44e42111cf1446fd94dec80b00258ae39f1081c24d4
font_01_sfnt_off00013f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F34 10316 bytes
SHA-256: f89005b3737fcce494641b1503ec9bd6941b404f76eab8aa282fbafc8a3f549a
font_02_sfnt_off00015666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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