Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2c64e319136722…

MALICIOUS

PDF

80.1 KB Created: 2021-08-29 03:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a573e2fc68a80de55661b16713898ea SHA-1: 7e400651bb86288741171f97da9c5a207470f925 SHA-256: ca2c64e3191367223f456ff2476e1291af25d6659dc5add0da2de94a6db15083
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. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS upload directories. The presence of these links suggests a phishing or redirection attack, aiming to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/eb80c6df482db2822bf5d46a581f0e38/80119627853.pdf In PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/30240462971.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610702a225818---botukobosubazo.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/kuzajenalewazuvekutovi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8a0b96f35bf087edd8b1e3517b8afccd/356506928.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c73325ca1a01f6253c350b878825452/81785203985.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4f4c0228c84ccfbefcca0daa3aea8b71/dotominapoxaripe.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/30235854673.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/suxafurasuxuxizamuj.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/pujuxixaxekoxijobitud.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/3apq1jvl7adcrkpnd0ddumcue2/nefubegewimot.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/1950780000.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/37586347955.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/77145019774.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6818odvih9p8pvmmipve75du07/42258954732.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/82351394872.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/17385540313.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae694a7dfc6---57106344329.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099c39cd0eff---41784749883.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/616180448d871ec2aa0493911c14202f/85159819188.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/digafexifobuwukunevefon.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160976aa7040c0---sazera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=resident+evil+4+ultimate+hd+edition+save+editorPDF 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_off0000d156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD156 10804 bytes
SHA-256: 24dc22b845e49d6167d373166e18a0d40834b4362e3a386a473edec63b767fa8
font_01_sfnt_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 18064 bytes
SHA-256: d8e58bd4bebd7d8f87113f5a28ecaac29e44a09cb52a6a52d94f43e1a9d5e07b

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