Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93854fc6fb2f480…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 23:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 604f1b3181bdbcd925ead662f83d9b2b SHA-1: 2dcbae1336b7c56585578b9f83d8da4572d9eb4b SHA-256: b93854fc6fb2f4800a56dd466d8abbc61c8bd3aa366a74fb7f25ef57346cafb8
156 Risk Score

Malware Insights

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

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, presenting numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://nuocmambason.com/upload/fckimagesfile/dbdb682f6b450cb57b798f3379b6d476.pdf In PDF document text
    • http://alrabbancapital.com/file/files/17752581716.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/dbccfcc7f293d3dfbdb2f4bd471c29b7/witid.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d6f3a85894eb7faa2b05744bcad841a4/benaxasumujenagoz.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/25733983203.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/99146150046.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/26857624112.pdfIn PDF document text
    • http://watch62.ru/files/files/58444534534.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/darovunoponez.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4821fc3d---26432901422.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613202f354837---lelutes.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/kovanenelemirazetujosunum.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3f9d7c9ddc259e90271d8043b315fac6/mujikusaligogipame.pdfIn PDF document text
    • http://farmina.ru/uploads/files/ranowowo.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/91363211779.pdfIn PDF document text
    • https://cakkue.com/contents/files/34834585800.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/23625589137.pdfIn PDF document text
    • https://jobtiara.com/files/files/badikagojijegixep.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/sejabib.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///54285397013.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1a4298f6311e6d43ef396fba4f5abe05/kafufunevudin.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/nadatovud.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/gonusalisivulujirus.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/dagitofatiwuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=messenger+lite+dark+mode+apk+downloadPDF 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_off0000ceb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 21212 bytes
SHA-256: 36ed5d10c5958fd953b1dee684ccfccf89c5601dff5f7f53b52b0717b5005417
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 10908 bytes
SHA-256: bdabd837a4b9c4cab0d439e4b223338b2235a123a339df4d6b459fea761e0ea6
font_02_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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