Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72685e9eeff7977…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 01:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8986fb42ee8d989e3ca18bc5c7a28a2d SHA-1: e60813e45f9cb4738323393d54d357ff79db4664 SHA-256: e72685e9eeff7977b2fd2974a86d438704ffd2e80d60030a5f6ca7d4cdc30cd7
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://infrive.ru/uplcv?utm_term=dominoes+gold+apk PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e7fceab8---91431587948.pdfIn PDF document text
    • http://anm-av.de/uploads/files/49989258154.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/38597229103.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/pozolu.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/83365942928.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346522459a1---27215793060.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/4331058861.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_18_53_11_8134.pdfIn PDF document text
    • http://jfe.hk/userfiles/96068522568.pdfIn PDF document text
    • http://goldmustang.ru/files/files/8227786276.pdfIn PDF document text
    • https://baptistfriends.org/media/xoginewulunu.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/22378475423.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/notivinomurubujokep.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/xabinomonorum.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/tunilizofowos.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/11965608119.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/wobigabufutik.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/61623552243.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/pewodotit.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/sakipakasifo.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/fa603b8f339828754fd178de68d611e0/xobamudosulet.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/zowakopufokasulanop.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/ziponuwafaji.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_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 19736 bytes
SHA-256: e9ed86e0bee6df882f7770aaeda58ac30406fd8e03c1b38750830ee14d009b00
font_02_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 10628 bytes
SHA-256: ababb2f154fc67f1a417994685d34e42bd9a8f378ca038d2d10687409f36cff2