Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73dbab6bb91ed23…

MALICIOUS

PDF

86.2 KB Created: 2021-09-08 22:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a17247a4153e1e32f680ff56f342769 SHA-1: 6e7677cc46de8e672701fea939fec4cee4262ba6 SHA-256: f73dbab6bb91ed23353419e513b2affd20d27d9433176d2680dc12c67bfc74d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing and hosting link farms. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=best+high+graphic+android+games PDF link annotation
    • http://td-mg.ru/uploads/files/vonubipevasozago.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613498cb42477---84834995711.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d3f2c83d52ccb420a44654e78d9dca57/5183001024.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f58021dd41---zamazixotapefubavaxawalij.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/57874906299.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/sigilajinugapabusozafi.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/wufomemadojogodomoguzozim.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/59365505031.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/10956656806.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/futuwoluxadofevo.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/68187427514.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/63240266056.pdfIn PDF document text
    • https://citytrafik.nu/images/file/12162045463.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1c2b7200---resazivigataz.pdfIn PDF document text
    • https://network-italia.it/file/vavawijixasubesa.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/52578109337.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/xamewujokasorevowari.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/43380106755.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/weridewejamavimirusowol.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/97733069207.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/bamalubowinoker.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/40435153046.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210905_51F9CA2438ECB228.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_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 10968 bytes
SHA-256: 647d05c09f004ab9eecdf4e9a64c1c72b1290f8cb7f2c879f4960896505c962d
font_01_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 16664 bytes
SHA-256: 75deb8c9d85d7a502fe2b5a2bda4deefb008286e326e028ab5fa20535d5a1f16
font_02_sfnt_off0001334c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1