Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74e801309f9c0fa…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 00:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cf12f927242766d7032094f428963bea SHA-1: d60ea1d76092f4a5bee96a2a2625dc3c1a6b98cf SHA-256: a74e801309f9c0fac00d72953cb64259887fd92b68b90d5cd193e62b8ed6b866
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple unknown URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF files within these URLs suggests a campaign focused on distributing malicious documents or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://evergladesharvesting.com/ckfinder/userfiles/files/88401357863.pdf In PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/mojupag.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/20916776210.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/jirawinanogarupapowevonif.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/gabosorixukukikizad.pdfIn PDF document text
    • http://esistore.be/userfiles/file/94733011839.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/74120465135.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/i3l5gjkujinpnaev6isdaf0e24/61083648277.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bf6edc451---xozuwivopumufosajo.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/10427173432.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/59ab9cfdd8eb829f9242a6a97d52c228/75283178041.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/42766267752.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/gimanipikinebiradez.pdfIn PDF document text
    • http://gapp.fr/medias/files/19186679049.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/nuwolitabewi.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/gizolalokil.pdfIn PDF document text
    • https://thehouseproduction.net/file/26118150862.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/88086687318.pdfIn PDF document text
    • http://signauction.net/userfiles/file/20563562271.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/vexuxulefegiwatug.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/sirapebijatovudabanud.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/bijunejanegavibegugomivam.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/66994888832.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/wizuvigodofelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cross+beats+androidPDF 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_off0000ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 16876 bytes
SHA-256: 7cc265520c555239cbb36351eac6366a44aca06139646a37ac87d00d9fd00dc3
font_02_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 10364 bytes
SHA-256: 80bb2bf39826f988cc9a39e83a6172a9107dfbeaef66e0eea01f8fb10ee5782d