Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24d85855f2752bc…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 20:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3794e23c5dedc86bc80f4625e0c209ac SHA-1: 66ad58d04609f5d5c2b9948a5b5be7f11042df75 SHA-256: b24d85855f2752bc6fb1a0500ecdbdd4f1ea3444ea557471f2a67cac82c0e215
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 uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f190aab0---65521830148.pdf In PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/roximoburawedorufe.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/warukosedemagofosi.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/95767004615.pdfIn PDF document text
    • http://lulanjina.net/upload/files/xapumugubaliwobuni.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/28469989483.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/73657009227.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/20067658058.pdfIn PDF document text
    • http://stealthwindow.tw/uploads/files/202109080516128846.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/sidada.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/38fdc59a72dc6e0353d5985761977296/begidexama.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/xulojadanexalapirejadixo.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/masiwuwi.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/malononifejiwuwam.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021921633.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/96676812591.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0f43543d6a746d9b40441c6deeaf68cd/tuvexuzikesorovozebewined.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109081712033439.pdfIn PDF document text
    • http://jar-ted.pl/file/zaniniwenu.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/nutobuvonamugep.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/dufatokoso.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/10514669769.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ac945d9bf68bdb435a92e523fe1140f6/71000182556.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/39463913170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=public+management+functions+pdfPDF 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_off0000bfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB1 15704 bytes
SHA-256: 2024343fde7ccfa7bb9cd85cfb99546029ec5b67f88837f6d2a09a6124348ae6
font_01_sfnt_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 11104 bytes
SHA-256: ad381998d97631ae5ae73832c9416088c5ee9a6cacc4cd44d1c4d34ba1805d9d

Open this report in the interactive analyzer, or submit your own file for analysis.