Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c127b7c4c2af61…

MALICIOUS

PDF

94.0 KB Created: 2021-07-28 04:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d3c350d0670912bc8a8cb62d716f9f4 SHA-1: 5918bf437a00eceac994fe87c57866fa005c7196 SHA-256: 17c127b7c4c2af61affc07ecc0daa8894711cadaeb78561d605d3cbdf60a2e13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are designed for SEO manipulation and hosted on disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://brilsports.ro/userfiles/file///tajifogamokir.pdf In PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160773d52bfd7f---16925563825.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c91290714---rewuzonis.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/19/file/20210519_153247_124.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/38961925421.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0l6soofo4bvs24iph5ao97u694/69819583203.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/sadajuju.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/jitonofamafonofofe.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608491481239f---75618389688.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/remobodi.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/wunonimojazulivatumujoba.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/miwilelunogonuzix.pdfIn PDF document text
    • http://alkanboya.com/files/file///sajaborarodowabap.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/74615301342.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f02ed6978b90c2852e1ad8e62973100c/46484894209.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe056917ae---44547206611.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6fee28184---3688550849.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdc276713a5f946b17f88fbf1ae56f31/94711072046.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/molanokej.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/20359043344.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/mouuu1l9ge2jhsob547ikb3d9g/mafubebasabufefoz.pdfIn PDF document text
    • https://baptistfriends.org/media/53119843100.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/jejesabokosamax.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0e29cec52---20374240187.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/finaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=frases+de+feliz+cumplea%C3%B1os+os+hermanas+gemelasPDF 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_off000103bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 18960 bytes
SHA-256: 7dfa91b9ad83023f3dac05033736cf3b0787670c2c8c3217b8df90b716210b73
font_01_sfnt_off000134ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AD 11312 bytes
SHA-256: 10a7c7724d495162901cea486604f4d1c7012299016dd77fe61018942e1bda5f
font_02_sfnt_off00014e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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