Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e8c5e2e73aa8cf…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 02:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 03023d6a45ef38ca7af167bc3ecf1408 SHA-1: c3711c874354ba0ef460e0da2d5719d7f9d2f297 SHA-256: c4e8c5e2e73aa8cf582dcca7270baf201298c117533447e20e80f96c856b2de0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

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://smidgel.ru/uplcv?utm_term=gps+signal+keeps+getting+lost PDF link annotation
    • http://zatuchlina.cz/upload/file/mamisa.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210914_A73B6E41354A659B.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/wogusibadurekodotonubin.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/974bd630ff686ef67d21c3bbc26e584b/zeligijetunujeju.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/goleruxolavisapi.pdfIn PDF document text
    • http://gyliver.ru/files/files/nomixazo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161465daa8bf28---17733925681.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614123a958dbf---37238511509.pdfIn PDF document text
    • https://paradigma.bg/uf/file/10396602730.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/83131266228.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/vasexefoxoxinava.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/72002098514.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/66487920571.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161339547820c1---6243084251.pdfIn PDF document text
    • http://potlista.com/file/files/97052447807.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/26279845584.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/tivumawaf.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/39697407835.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/54784074328.pdfIn PDF document text
    • http://ibb-online.ru/f/file/bulisomofemevelokoxenot.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/3965524544.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161401caa5f487---bevirufe.pdfIn PDF document text
    • http://jadeite.ru/images/file/tobonusubufaketunagux.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/38885731060.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_off0000b8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D7 10460 bytes
SHA-256: 45c932c1cbf9724b4a8275dd641978dd29ad4d2e31baea444d8ef01e15a5a553
font_02_sfnt_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 16668 bytes
SHA-256: 979571386b5c2257b555a5ea25ed3aad344388e455d854a47a7acf8f2248b66d

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