Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ef25dcab1871aa…

MALICIOUS

PDF

73.1 KB Created: 2021-07-03 04:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0a9bab07d1702556c5aa42fe236ed309 SHA-1: 7ed066dc6f37ddce6fd463a59eebf042df92644c SHA-256: c3ef25dcab1871aaa67c12761361c1a36af06ebd14e5b7bcf76de1a0da0c7922
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The heuristics indicate the PDF functions as a link farm, directing users to numerous external URLs, many hosted on disposable or compromised domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=100+brl+to+usd PDF link annotation
    • http://aldara-latinoamerica.com/userfiles/file/zosarejelixepamujedonag.pdfIn PDF document text
    • https://lapakunited.com/contents//files/45648529350.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/15500946461.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2qvtlvhrbblb5i48lcnndie5ri/zilixifegutufopis.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/98882611391.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075577b82f---vironuvovipopowi.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pagujinuvodulirevepuxum.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5f2422735d8f31b226b8128eb1b84305/gatafanuzojutofenosoje.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8743334cf828a206901939bb7f56fea/vugazelitorewuvofobosu.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/nupodokes.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87dc2bd40---domudegok.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eee8d980b---93950547117.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/02abde156159ffa580b38fadca39f9a9/43964536838.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/29321986136.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079f294c851d---tixiragebifuborodazopov.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/70049867119.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d78d838d3b---33745846894.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/86733867963.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/ronejolanigal.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/vowipebejeda.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608632c27603c---99068256069.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7d47a2b9---fidamonejenavajemi.pdfIn PDF document text
    • https://luminex.pl/upload/file/jaginesejevenofekiwatuguf.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_off0000bd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 10068 bytes
SHA-256: 68be52b9a1169c0d53b5bfb38ad3df4afe4a9a99f9a70c6fa8f49bfbde3b9405
font_02_sfnt_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 16840 bytes
SHA-256: be13aaf8bd3450c21a481e39c79bf4016bb647917fd7960ff7febd5caf308942

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