Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa11cc4fbab638db…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 18:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad369861c97deb19e72bb6b1e528a4a9 SHA-1: 4ac465ac8e7857e217b06eff86ecdb84dd577bbe SHA-256: aa11cc4fbab638dbcafb6c18084f1a3413cbd7feededa769949f29befff8f204
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sanidom.pl/img/file/jejolizipeb.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a85181643---kalelopurofinexoseregut.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/zojalix.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614593801c3db---bigozirazuloz.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161490b802bddb---71869145642.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/20011421107.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wegipizaj.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/sirisuvonedafuw.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/nilebisosozuvuzusofo.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/12695223973.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/45670dfa2bfac20b27a308d1679ee363/mofipovikudululufo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/gukazozobevabadafukulopef.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/82014268451.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109171409345296.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ed2fb6efac0551f0759303f29b2328f2/pupigegado.pdfIn PDF document text
    • https://nomortiga.com/contents/files/85210093692.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/57665395999.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/59665752605.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161304b2ed1ec0---97399212795.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/paxevagijo.pdfIn PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/23998825728.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/91076431652.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/65596783219.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161400cc94dda2---56957037529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=china+rich+girlfriend+ebook+freePDF 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_off0000b40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40C 10752 bytes
SHA-256: 75a0d28395c966855786abfb080ac731ed0a6e71161e29da2f00702a0ed7c4cc
font_01_sfnt_off0000cc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC70 16012 bytes
SHA-256: 2a902f253ab1c2b60ffa8a30f6fbad64d9c5e33500346e62043f887d46d6f9db
font_02_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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