Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e23c6847bee353…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 10:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77f73acc72ba9f097fed777eb5e5b9db SHA-1: 231616510e141f7306c1927d088a098792e55a19 SHA-256: c6e23c6847bee3538613825e87d8b7b272273ba83ad02c76914e48a80ed4a9ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=douglas+brown+teaching+by+principles+pdf PDF link annotation
    • http://akademibt.com/resimler/files/gegolafanutakelibeximalo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/32uisa2h9497i04mptrou8ml51/19762088002.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4610473c---denalekiwerotabawojegako.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/31693296471.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/87523565885.pdfIn PDF document text
    • http://badgerhillfarm.uk/21271953373.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/17291991368.pdfIn PDF document text
    • https://j26clean.com/upload/files/48142794308.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/050708249813.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/subor.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/buvoxa.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/pewetutexikenebuf.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9cd00602---jipelimoxusiparew.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/nebat.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/68628905257.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/meborefuribika.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd70baaf13---baxibiva.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/gupovoluta.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/56848904506.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f070a0af46---80201442402.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/26642305445.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/tataxurasamemaxuduti.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/pivemujabozut.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/58cfdedb8915a406d0208905592ece4c/66946482734.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_off0000e6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B4 16784 bytes
SHA-256: 758103904fc0fbf9e76522f726ce57f1c713bb838a450eec512ea7ecf98b36fc
font_01_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 11340 bytes
SHA-256: 5ec8c2ee523a8afda5d7b570e11ff1410d6cb1e74ef27b3a92403c48834259e2
font_02_sfnt_off00012c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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